Fitness Instructors
Our expert trainers possess diverse and competitive backgrounds in athletics,
as well as 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 thoroughly workout a large group of people. 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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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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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 2 Cyclist, Ironman triathlete, and competitive swimmer.
Why she's so great:
Marissa is a competitive cyclist with her own coaching business,
promotes competitive women’s cycling in the SF Bay Area as
a racing mentor, and volunteers with the San Francisco Bicycle Coalition
to support cyclists' rights. Her spunky personality and innovative
coaching techniques will get you so energized in the mornings that
you might forget about your daily caffeine fix.
Email Marissa |
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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's unique:
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 become extremely
challenging.
Email Galen |
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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's special:
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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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 rocks:
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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Ashley Relf
Trains:
Morning classes in Golden Gate Park.
Brains:
BA, Communication Studies, SFSU
Certificate in Exercise & Sport Performance, MA Candidate, Sport
Psychology, John F. Kennedy University
Brawn:
Swim, Bike & Run, Repeat.
Why she's exceptional:
In addition to her expert coaching and fitness training background,
Ashley has achieved an impressive list of personal accomplishments
including: the Olympic Distance Triathlon National Championships,
Half Ironman Top Finisher and Ironman World Championships, as well
as the Boston and New York Marathons. She is currently the Lick-Wilmerding
girl's high school cross country head coach as well as the fitness
coach and a former player for the San Francisco Nighthawks, a local
women's semi-pro soccer team.
Email Ashley |
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Devin Nagata
Trains:
Morning classes in Golden Gate Park.
Brains:
BS, Sport Exercise and Wellness, Dakota Wesleyan University
ACE Certified Personal Trainer
Brawn:
4-year NCAA football player.
Why he’s fantastic:
Devin is a personal trainer focused on making everyday athletes.
He's been using his first-hand experience with athletes to create
better bodies for personal clients and groups for the last four
years.
Email Devin
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Carli Johnson
Trains:
Morning and evening classes in Golden Gate Park.
Brains:
NASM Certified Personal Trainer
NPTI Certification
TRX & Pilates Certified
Brawn:
Kettlebell rockstar, spinner extraordinaire, and yoga enthusiast.
Why she's so dynamic:
Carli has been training clients for over three years. She has been
helping people make lifestyle changes and achieve their fitness
goals with her targeted programs, nutritional counseling, and outstanding
motivational skills. Carli specializes in getting new moms back
into healthy fitness routines as she is a mother of a young daughter
and understands how difficult it can be to balance exercise, work,
and raising a family.
Email Carli |
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Christine Gayoso
Trains:
Morning classes in Golden Gate Park.
Brains:
BS, Nutrition and Physical Fitness, University of Missouri, Columbia
NASM Certified Performance Enhancement Specialist
NATA-BOC, Certified Athletic Trainer
Level D Coaching License, United States Soccer Federation
Brawn:
Competitive Bay Area soccer player and high school athletic trainer.
Why she's terrific:
Christine is a sports medicine professional, specializing in the
care and prevention of athletic injuries. She has over ten years
experience training Bay Area high school athletes in addition to
adults and small groups of all ages.
Email Christine |
Ready to give our program a try? Register for our upcoming trial classes.
