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


This is our signature weight loss program. In 14 days you'll follow a lifestyle approach to sensible, results driven, weight loss.


Our personal trainers will motivate you to get in the best shape of your life no matter what your workout environment or current physical condition!


Our professional personal trainers will help you understand exactly how your body burns calories both through diet and exercise!

Our Services Also Include:

Fuel Performance For athletes
Yoga Training Find your Inner Zen
Group Classes Train with Friends
Corporate Wellness Improve workplace sustainability
Bariatric Specialty Fitness for weight loss
Motivational Speaking Empowering Personal Change




Step 1

Stay physically active

Try to get at least 30 minutes of exercise three times a week, but any amount of exercise is better than none at all! If you do not want to go jogging or swimming, try going for a brisk walk with a friend, working vigorously in the yard, or riding your bike.

Step 3

Healthy mind equals healthy body

When you are in a good state of mind, you make good decisions for yourself about your job, your lifestyle, and your health. Try to reduce stress in your life, get enough sleep and make time in your life for things that are fun.



Step 2

Healthy Living

Your body needs all four macronutrients (carbs, protein, fat & water) to stay healthy and strong. Eat 4-7 servings a day of non-starchy vegetables and 2-3 servings a day of fruit. Cut down on alcohol, fast foods and sugar.

Step 4

Be free of harmful drugs & alcohol

Tobacco causes more health problems than any other drug. Too much alcohol causes liver damage, fetal alcohol syndrome, and other health issues. Try cutting back on both.


Take the test. Train Smarter!

Resting Metabolic Rate  VO2 Max Testing

Do you want to know EXACTLY how many calories your body burns at rest? How about your cardiovascular fitness level…would you like to know how fit you really are? JKFITNESS has state-of-the art equipment that will individually test your fitness level, metabolic rate, where you are most efficient at burning fat, and what type of calories your body is burning. Understand the physiology of your body so that you do not waste valuable time in the gym! Call and schedule your appointment today!

these are our
client testimonials


JKFITNESS helped me realize that exercise and movement are extremely important to my health and well-being. I lost weight, lowered my blood pressure, and improved my cholesterol; I basically improved my overall health and fitness.  


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!  


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 and the JKFITNESS staff is amazing!  


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

  • Julia's Quotes - Exercise is fuel for your soul

  • Julia's Quotes - Nutrition is 80-90% of weight loss success

  • Julia's Quotes - Quality not quanity is key to ultimate wellness!

  • Julia's Quotes - Feeling negative? Flip the switch!

  • Julia's Quotes - Exercise is insurance for long term weight loss


personal trainer
(San Antonio)

  • wellness, diet instruction, group classes, personal training
See Full Bio


personal trainer
(San Antonio)

  • wellness, diet instruction, group classes, personal training
See Full Bio


personal trainer
(San Antonio)

  • wellness, diet instruction, group classes, personal training
See Full Bio


personal trainer
(San Antonio)

  • wellness, diet instruction, group classes, personal training
See Full Bio

contact us!

  • 15683 San Pedro, San Antonio, TX 78232

  • 1800 NE Loop 410, Suite 100, San Antonio, TX 78209