Koi Fitness Instructors
Our trainers have diverse and competitive backgrounds in athletics, and have attained the highest levels of education and certifications.
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Stevan Krstic, Owner and Founder of KOI FITNESS
Trains:
Morning classes in Golden Gate Park and the East Bay.
Brains:
BS, Exercise Physiology and Kinesiology, SFSU
ACSM Certified Health Fitness Specialist
NSCA Certified Strength and Conditioning Coach
USA Weightlifting Certified Club Coach
Brawn:
Collegiate All-American in track and field, former competitive bodybuilder, football and soccer player.
Why he's the best:
One of the first boot camp instructors in San Francisco, Stevan's love of fitness and commitment to helping others shines through in his coaching. He is a master group exercise instructor and knows how to bring a large group of exercisers to their knees. If you are ready to get in the best shape of your life, then he is ready to help you get there.
Email Stevan
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Alyssa Hershkowitz
Trains:
Morning classes in Golden Gate Park.
Brains:
BS, Exercise and Sport Science, University of Utah
ACSM Certified Health Fitness Specialist
ACE Certified Personal Trainer
YMCA Group Cycling Instructor
Brawn:
Ironman triathlete and competitive runner.
Why she is amazing:
Alyssa has been teaching and training clients for over a decade.
She may not be as loud as a drill sergeant, but never underestimate
her creative and seemingly-simple workouts that produce results.
She also won a push-up contest at a friend's wedding--putting a
few guys to shame.
Email Alyssa
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Galen Pewtherer
Trains:
Morning classes in Golden Gate Park.
Brains:
ACE Certified Personal Trainer
Brawn:
Ultra marathoner, extreme adventure athlete, and competitive cyclist.
Why he rocks:
Galen founded Bay Area Adventure Racing Babes & Dudes (BAARBD) and is an exceptional endurance athlete. He excels at teaching proper running technique and sneaky exercises that seem easy at first, but are extremely challenging.
Email Galen |
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Marissa Axell
Trains:
Morning classes in Golden Gate Park and the East Bay.
Brains:
BA, Biology, Willamette University
ACE Certified Personal Trainer
Brawn:
USAC Category 3 Cyclist, Ironman triathlete, and competitive swimmer.
Why she is so cool:
Besides being program manager at Koi Fitness, she's also a competitive cyclist, mentor to new women cyclists in the SF Bay Area, and volunteer with the San Francisco Bicycle Coalition to support cyclists' rights.
Email Marissa |
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Vajra Granelli
Trains:
The infamous Saturday workouts at Baker Beach.
Brains:
USA Boxing Coach
I.S.K.A. Kickboxing Coach
Black Belts in Aikido, Kendo and Kenjujitsu
Brawn:
Competitive boxer for 25 years, kickboxer for 20 years, and coach to top fighters in the SF Bay Area. You don't want to mess with this guy.
Why he is The Man:
Vaj's unique motivational techniques run the gamut from telling jokes, shouting words of encouragement, and surprise take-downs for a chosen few. Nothing fazes this man. He’s also a private security professional.
Email Vaj
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Brighton Miller
Trains:
Morning and evening classes in Golden Gate Park.
Brains:
ACE Certified Group Fitness and Personal Training Instructor
Brawn:
Long-time bootcamper and competitive runner.
Why she is awesome:
Brighton’s love for running and bootcamp workouts inspired her to change careers and become a talented personal trainer. She has a background in ballet and modern dance, and has successfully completed many half marathons and local adventure races. She’s appreciated for her tough, thorough, yet motivating workouts.
Email Brighton |
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Jon Maples
Trains:
Morning classes in Golden Gate Park and Baker Beach.
Brains:
BS, English/Journalism, Carroll College
ACE Certified Personal Trainer
Brawn:
Long-time bootcamper, runner, and baseball player.
Why he's so special:
Jon has been a runner, slugger, and bootcamper for many years. His passion for athletics motivated him to get his ACE certification and become a fitness instructor. He specializes in speed and agility training, as well as innovative running and strength-training techniques.
Email Jon |
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Aileen Medina
Trains:
Morning classes in Golden Gate Park and the East Bay.
Brains:
BS, Exercise Physiology and Kinesiology, SFSU.
MS, Exercise Fitness and Health Promotion, George Mason University.
Holistic Health Counseling Certification, Columbia University.
Brawn:
Avid runner, climber, cyclist, hiker, yogi, and explorer of sports and movement.
Why she is so great:
Don’t let her petite frame fool you: she’s one of our toughest trainers out there. She has many years of experience training competitive athletes and has extensive knowledge of rehabilitative therapy. As a teenager, she played on her high school basketball and softball teams, and she played 3rd base on the women’s softball team at SFSU.
Email Aileen |
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Joe Pappas
Trains:
Morning classes in Golden Gate Park.
Brains:
BS, Kinesiology: Exercise and Movement Science, SFSU
ACSM Certified Health Fitness Specialist
SFA Senior Adults with Special Needs Fitness Leader
Physical Therapy Aide
Biology Teacher/Chef
Brawn:
Life-long athlete in various sports including: football, tennis, baseball, skiing, martial arts, running, swimming, and cycling.
Why he's so dynamic:
With ten years experience as a personal trainer, Joe takes pride in motivating and helping fitness enthusiasts reach their next level of performance. He will challenge you with innovative strength training exercises and provide you with tips and tools to break through any training plateaus.
Email Joe |
Ready to give our program a try? Register for our upcoming trial classes.
