Bring a Friend Month
Bring a Friend! From October 1st-31st, clients can treat one friend to a complimentary week of classes. Attend unlimited classes for 7 days...
Fall Yoga Series
New Series begins Sunday, October 2nd! 
Now Offering Private Barre Sessions!
Private Barre sessions will be held in Studio Reformer. Open the flyer or visit the website and go to the Pilates tab for more details. 
Reverse Pull-up


"I really enjoyed the experience. I told Mary that I was a newbie with lower back issues and flexibility issues, and she was very accommodating and encouraging for where I am at right now. I felt very welcome and comfortable and I think I am right where I need to be to get started. She was very calming and in addition to improving flexibility, I can tell that it will help me de-stress. It's nice to have "permission" to breathe! "
Yoga Client
"The class is pretty wonderful, and Mary is pretty wonderful. So happy that I signed up. It is already making a difference in my stress level and my week.
Yoga Client
"I have been going to strength training classes for over a couple of years now. I enjoy exercising with a nice group of people and have found the class very helpful at both improving my running and preventing injuries. Best of all....I can now see my triceps. "
Strength Training Client
""I have been working out with Tim O'Neil since the first of May, 2005 and achieved great results!! Overall, I have lost 5% body fat, 10 pounds fat mass, and 8.75 inches in measurement. I have tried many diets and programs from Atkins to Weight Watchers and have never achieved long-term success. Tim provides great leadership, a very positive attitude and raises the bar each month. I am confident he has helped me fundamentally change my behavior and my improved appearance, energy level and overall health is permanent.""
Steve L., Client of Tim
""One of the best decisions of my life was to start personal training at Fitness By Design. I feel so much healthier, more energetic and have a more positive outlook on life. What could be more important? If you are looking for a personal trainer, you have found the very best with Barb Mendoza. She deeply cares for every client and customizes a program that delivers terrific results."
Client of Barb Mendoza
""Yoga's a great way to de-stress after work!" "
Susan, Client of Mary
"I really enjoyed my first session with Amy. I feel like we are off to a great start. She gave me lots of information and answered all my questions. I am very motivated and with Amy's help I hope to reach my goals. "
Client of Amy
"I enjoyed every minute of Mary's class! It's a bit of a drive for me, but it's worth it to practice with such a wonderful teacher. "
Yoga Client
"I started practicing yoga at a very vulnerable time in my life and in Mary's classes I have learned how to heal myself from within and that it's ok to take care of me first. Through the practice of yoga under Mary's guidance, I have gained more confidence in myself to handle whatever life sends my way. I feel such inner peace every time I leave one of her classes that I can't wait for the next one. Mary is very passionate about yoga and brings that passion into every class she teaches. I highly recommend Mary to anyone who is looking for peace and serenity in their life. "
""Barb Mendoza changed my life!!! I was able to work with Barb through my employer, Businessolver, as a part of our overall wellness initiatives. Barb personally worked with me to find healthy targets, reviewed me food diary, made suggestions...and continually gave me positive feedback and advice. As a result, I dropped 2 pants sizes, 1 shirt size, lost 25 lbs and ran a 5K! More importantly, she gave me the tools to maintain my health and attain greater fitness. She is a true lifesaver and I am incredibly grateful for her work!" "
Jim G. client of Barb Mendoza
"I am really enjoying my yoga classes with Mary. I've never done yoga and I couldn't have asked for a better instructor for my first experience. Mary is fantastic - she has a very calming effect on my mind and body - can't wait for Monday evenings!""
client of Mary
"My lungs always feel so expansive the next day, my brain is calmer, and I've lost 9 pounds! There's just something about mindfulness, energy, and quiet that is so wonderful. AND I would like to say: You, Mary, are the BEST! I've been to other yoga classes, and they just don't have the same "spiritual" tone. But it's not preachy... just simple and nice. Also, I don't ever feel that I am in danger of injuring anything. You always focus on just doing what you can without hurting anything which is perfect for me!!"
Client of Mary
"If you haven't done yoga with Mary St. Onge, you haven't really done yoga yet. I have done yin yoga, mixed level yoga, Bikram yoga and yoga therapy, so I believe I speak from experience.
I had just discovered yin and was trying to learn how to teach it when I started attending yin with Mary. It begins my week with such a sense of purpose, self-esteem and serenity that I may have to travel to Minnesota in the summer. The mixed level is not just the poses, but Mary teaches them with a theme which knits the series of 8 classes together. It means you don't want to miss a class. I have also learned so much more about the marriage of breath and movement that is true yoga. Bikram is relatively new for me, but after experiencing two different instructors, I love Mary's less rote recitation of the poses. I always feel pleasurably wrung out at the end of the class."
A grateful and enthusiastic yogini
""As a mother of 3 young boys, it is difficult to find time to work out. I know that when I work with Barb, I will get maximum results in the minimum time. Barb has learned a lot about me and knows what to focus on so I get the most out of my workout. She is incredibly motivational and I appreciate her dedication to, not only my health, but my families' health as well."
RKM, West Des Moines
"I loved Pilates class as well! :) I want to tell you as a business woman and a frequent flier at your Studio that I appreciate greatly what you have put together. It is clearly "fitness by design" and I love being able to pick and choose. You have chosen and retained excellent staff. Your studio is clean and inviting. Everyone is very responsive. I can appreciate how busy your professional life is because there are so many moving parts. I want you to know how much I value what you offer.
Pilates Client
"I simply can't imagine facing the challenges in my life today without the weekly care and feeding of my physical and spiritual yoga connection with Mary St Onge. I had dabbled in yoga via DVD's, but didn't know how important the in-person instruction can be. Mary takes us all where we are, knowing every day is different, and helps us learn to acknowledge, address and diffuse the physical and mental distractions that impair our clear sense of purpose. Although that may seem a little deep, every once in a while, I just have a practice that lets me tune out the world and breathe. I am so grateful for Mary's loving leadership and her direction that inspires me to challenge myself as we practice together. Still striving for flexibility. "
Margaret Buckton
"I turned 46 this year and I have never felt better. 4 years ago a friend and I said let's try yoga....and I thought I'm not a pretzel... but we went anyway not knowing what to expect. It has been so beneficial not only for my health but my mental well being. Mary has taught me to have a better posture, how to stretch out with your own breathe for full benefit of the practice. I think one of the most important things also is how to meditate and slow your mind. I recently quit smoking and going to my breath has calmed me down numerous times....Also, Mary says yoga is a practice-- you're not expected to ever be somewhere in your practice...just what you can do when you can do it. I go twice a week and even got my husband to go on Sundays with me....he absolutely loves the class..If there was ever a skeptic it would have been me or my husband.....we are hooked and found the BEST teacher.
JD, Des Moines
"I like the classes at Fitness by Design because they are rigorous and demanding, yet carefully planned and monitored to combine strength building and some aerobic components. The instructors are attentive and well organized, so I am confident that I am doing the exercises in the most effective and safe way. The classes are varied enough to remain interesting, but there is enough consistency to create a sense of real progress over time. I am not always happy while actually doing the class, but I am always glad to be there and sorry when I have to miss! I know I've gained a lot of strength and flexibility - and I've had a good time as well! "
Kathy Eckhouse
"Thanks also for getting me started with Jill and Julie. I learned lots from both of them. I continue to think about those things as I live and "work out"! "
Pilates Client
"You go above and beyond to give everyone individual attention and your dedication to making your studio great is obvious. I have worked out at many places in the last 30 years and hands down yours is the best I've been to. The classes are never the same and always challenging. I love going!! "
"It was great! I really enjoyed the rejuvenation. I slept great that night! I'm bringing a friend to try next week!"
Yoga Client
"I have had yoga instructors in many parts of the U.S. and I must say that I think Mary is the most talented that I have ever experienced. She is amazing! I was very happy with the mixed level class and plan to attend again next Sunday. "
Yoga Client
"I have felt very comfortable and welcomed at your studio. Because I am "dripping wet" at the completion of each class, I know I am certainly benefitting from the classes. I appreciate the cleanliness of your studio, availability of water, a prompt starting time and your professionalism. I like that you "mix up" the routines and find them all challenging......extremely! Am I dying to come to Do I feel empowered, happier, and full of energy at the end of each class.......yes. Thank you, Barb, for wanting feedback. That speaks volumes about you and your business!"
Strength Training Client
"I was made to feel very welcomed. Mary set up a area for me to use a chair if needed. "
Yoga Client
"I attended the last two 8 week sessions of the Yoga portion. My back feels better, I have more flexibility, and I feel better overall in my general health. I think that the classes are great. Nessa is a good instructor an provides a stimulating environment. I plan to continue my participation in this activity. "
Yoga Client
""Last year, I decided to take more initiative with my health. I have been working out with Barb once a week and have recently added 2 fitness classes. I've been very adamant about taking this slow and steady- I want to change how fitness occurs as a long-term commitment. I can say that the variety of activities I participate in through FBD and the exercise I do on my own have really made a difference in my daily life. I'm stronger, more fit and have even noticed that my clothing fits better. Fitness By Design has been an all-around great addition to my life.""
PT Client
"I have been working with Tim for several years and it continues to be a great workout -- never the same thing twice -- but always a challenge. It is great that it can be additive to what I already do. Sometimes my kids come along and the are amazed at how tough it is! It is great!"
PT client
""Mary is an outstanding instructor and is very prepared for her 8 week series of classes, which are challenging and interesting. She explains the purpose of the positions, checks regularly to be sure we are in sync with the end goal and gives precise instructions. There is no doubt Mary creates a relaxed and friendly environment; I feel at peace the moment I walk into the studio.""
Client of Mary
"In less than one year, I have reached (and surpassed) every fitness goal I set for myself thanks to Fitness by Design. I have lost 30 pounds, 30 inches, doubled my cardiovascular stamina, and completed a 10K -- all things I never thought could happen a year ago. My trainer has been a positive force in my life (and stern when she needed to be) and the class instructors are kind, energetic, and patient. "
Becky M., client of Barb
""Yoga's a great way to exercise & relax both the body and the spirit.""
Karen, Client of Mary
"I love coming to class, each class is different, so the interest I have, and my muscles have, keeps me coming back to see what is next. The personal attention and the smaller size classes are wonderful, the instructor lets me know if I am doing the exercises correctly. My most noticeable benefit, other than feeling so much better, was skiing this past winter, I could do a complete run without stopping, something I hadn't been able to do in a long time. A positive attitude by both the instructor and the class makes this something I don't want to miss.~Client"
Strength Training Client
"I started attending Barb Mendoza's strength class once per week just 4 months ago. I also decided to train for another marathon near that time. As a woman in my 50's, I found the strength class to significantly develop my core and overall strength and I believe this really helped me throughout the marathon and, in particular, in the last 6 miles. Barb is very good about watching individual technique within the group class and offers specific feedback to gain the most benefit. I really appreciate that! I completed the marathon taking 5 minutes off of my previous marathon time and qualifying to run the Boston Marathon! "
Strength Training Client
"My journey to a healthier life has been a slow one, and Barb has supported me all the way, pushing me when I needed it, helping me noticeably increase my balance, agility, functional strength, and confidence. This year I decided to focus on weight loss. Barb held me accountable to that, celebrated small successes with me, and helped me keep the inevitable setbacks in perspective. I've lost 20 pounds, and we're still going!"
Client of Barb
"I've been attending group strength classes for more than a year and in that time my HDL cholesterol (good cholesterol) has risen 16 points and my LDL (bad cholesterol) has decreased 17 points. It is remarkable to see such a dramatic change at a time when I stopped running and swimming due to injuries and shifted my exercise focus to group strength classes. The instructors are certified, well prepared, and lead with enthusiasm and humor. It's healthy and it's fun. I love taking classes at FBD."
"If I can point out one obvious gift from God, it's having Mary St. Onge as my yoga instructor. She's a perfect fit, like a tailor made suit. She does not merely go through the motions of yoga. She plants seeds of wisdom, she explains the physical/emotional benefits of the yoga poses and is always mixing it up so you are constantly learning. I love how we actually breathe through poses slowly as opposed to sweeping through them like a hectic day. Mary is passionate about what she teaches and with that kind of energy, you get so much more from your practice. She's awesome! "
Yoga Student

Personal Training

Personal Training

Your fitness goals should change frequently as you go though life because your life journey is always changing. As fitness professionals, it is our job to give you detailed instructions on how to reach your short- and long-term goals. Along this journey, you will need to fuel yourself properly and have a positive attitude. There will be changes and adjustments to your program that keep you interested and excited about reaching your goals. Adventure and fun are part of any journey, including your fitness one! Remember to focus on all aspects of health---sleep, exercise, nutrition, stress management, relationships and work satisfaction.

Click Here for Private Personal Training

Click Here for Group Personal Training

Why use a Personal Trainer?

Good question! One with as many answers as the number of people you ask. Workout sessions are so much more enjoyable when you know what you are doing, why you are doing it and where it will take you. Would you like to achieve one of the following goals?

  • Feel Better
  • Lose Weight
  • Lower Blood Pressure
  • Reduce Stress
  • Lower Cholesterol
  • Reduce Risk Factors for Heart Disease
  • Perform a Sport More Effectively
  • Gain Cardiovascular Endurance
  • Increase Flexibility
  • Maintain Ideal Weight
  • Gain Strength
  • Improve Body Composition
  • Function More Efficiently in Daily Life
  • Improve Balance/Coordination
  • Challenge yourself to do a new Physical Activity

The accountability a trainer provides is invaluable to the success of your fitness program. With your hard work and commitment and our expertise and motivation, you can start improving your health TODAY!

ACE’s Top Ten Reasons to Hire a Personal Trainer

Motivation – Personal trainers wear many hats, serving not only as coach, but as an educator, confidant, role model and a major source of motivation and encouragement as well.

Consistency – Do you find it difficult to stick to your program? Scheduling regular appointments with a personal trainer helps eliminate any excuses you might come up with for not exercising.

Safety – Unsure about how to use the chest press machine at the gym or how to perform walking lunges without hurting your knees? A personal trainer will show you how to exercise safely (including which exercises to avoid) and instruct you on the proper and safe use of exercise equipment.

Individualized Instruction – What works for one person, may not work for another when it comes to choosing an exercise program. A personal trainer will develop the most effective program for you based on your fitness evaluation results and personal goals. Beginners in particular benefit from instruction on how to perform specific exercises and program planning.

Effective Workouts – Today's hectic lifestyles mean you don't have time to waste on ineffective exercise routines. Personal trainers help maximize your time by providing workouts designed to meet your goals quickly and efficiently.

Supervision – Personal attention during exercise is the primary function of personal trainers. Need someone to spot you while you do pull-ups? Looking for feedback on your running form? No problem-that's what your personal trainer is for-to observe, assist and, if necessary, correct as needed.

Sports-specific Training – Many amateur and professional athletes work with a personal trainer during the off-season to prepare themselves for in-season competition. Whether you want to shave some strokes off your golf score or beat your brother-in-law at tennis, a personal trainer can tailor your program to your sport of choice.

Injury Rehabilitation – Injuries and accidents can prevent you from participating in your favorite activities. An experienced personal trainer, however, can make the road to recovery a smooth one by recommending exercises that emphasize overall muscular balance to prevent future injuries.

Special-needs Training – Research confirms that individuals with health challenges such as diabetes, asthma, osteoporosis or heart disease benefit greatly from regular physical activity. These conditions, however, can make exercising safely a challenge. Many personal trainers are experienced in designing programs that address the special needs of these and other conditions.

Ego Boost – It's a fact-feeling good makes you look good, and vice versa. Not only can your personal trainer help you achieve your health and fitness goals, they provide you with positive feedback on your performance and bolster your confidence to take on new challenges.


Fitness By Design | 4715 Grand Ave. | Des Moines, IA 50312 | 515-277-9721