JKFitness of San Antonio offers professional health and fitness expertise, specialized personal training, and our family is committed to your success.
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Our professional personal trainers will help you understand exactly how your body burns calories both through diet and exercise. We have a wide variety of fitness services for you.
About Our Services

Lose weight in our group classes! Our group classes offer variety and keep you motivated in a small, personalized, and private group setting! Call today for more info.
Group Training Info

The JK Fitness Power 30 is a comprehensive wellness program that will hold you accountable for 30 days.  Start your healthier beginning today!
Power 30 Program



I've been with Julia Karlstad for five years and it's been the best exercise experience I have ever had...quite simply, I wouldn't ever use anyone else and can't imagine a week without her services. She's just that good! –Trish

I have been with JKFITNESS for a little over two years. I have trained with almost all the trainers and all have helped me improve my stamina, flexibility, muscle tone and strength. Most importantly they all encourage me to reach higher goals and they do it with patience, fun, and a clear understanding of health, diet and exercise. –Ann

Julia is incredibly passionate, caring and she listens! It's evident that wellness is not work for her; she lives it!  Her knowledge helped me maximize my efforts and her ongoing encouragement made me feel like I was her only client! –Lorena

Thanks to JKFITNESS...I am healthier, stronger and happier than ever. For the first time in a long time...I am living! –Dona

Whether you want to lose weight, tone and sculpt, get strong or just improve your overall health, the trainers at JKFITNESS can reshape any lifestyle, anybody, and any mindset.  I have an extremely fast-paced lifestyle and JKFITNESS is now part of my business week. –Evie

My life has changed tremendously since I became a member of JKFITNESS.  JKFITNESS got me moving, which was difficult for me at first because I was not accustomed to exercising.  At JKFITNESS, I was given a fitness prescription that helped me know exactly what to do, week by week.  With trainer attention, I noticed differences daily.  Overall, I did lose weight, lowered my blood pressure, and improved my cholesterol; I basically improved my overall health and fitness.  JKFITNESS helped me realize that exercise and movement are extremely important to my health and well-being; they continue to be a necessity to my new healthy lifestyle. – Michelle (70 lbs lost and maintained over 6 years)