TSI USA Inc

TEAM PEAK

Sergei Cherednichenko

Fitness Coach & Trainer

Sergei is an avid endurance athlete who coaches at Team ICG Russia. He trains individuals in outdoor sports like cycling and running to HIIT to TRX to senior sports.

Bryan Dermody

Powerlifter

Bryan has a vast knowledge in the strength arena as a former football athlete, Collegiate Strength & Conditioning Coach, and NFL Assistant Strength & Conditioning Coach. 
 

David Douglas

Powerlifter

David is a former Marine who was presented with athlete of the year 3 times during duty.  While in the Marines he got into powerlifting and was ranked #6 in the World in 2019.
 

Jared Enderton

Weightlifting Coach / CrossFit Games Athlete

Jared is the Head Weightlifting Coach for Invictus.  He has competed in an array of sports from wrestling to Strongman to weightlifting to CrossFit.

Carissa Johnson

WBFF Pro / NPC Bikini / Fit Mom

After a startling pedestrian car accident Carissa didn’t know if she would walk again. Through determination she has come back even stronger in all facets of her life.

Jada Kelly

Fitness Coach & Trainer

Jada began her fitness career as a P.E. teacher and has shifted focus to coaching women.  She helps them to prioritize health to help them look, feel, and be their best. 

Danyelle Mastarone

Retired NPC Competitor / Fit Mom

Danyelle started out as a group fitness instructor and caught the figure competitor bug.  She has since retired and her focus is on being a healthy and fit mom to her son.

Tim Nassen

Masters Bodybuilder / Retired Strongman

With 30 years in education and ending his career as an Athletic Director, Tim Nassen retired from his career and competing in strongman to try the sport of bodybuilding.

JP (John Porter Jr.)

USA Master's Track & Field Athlete / Fit Dad

JP is a proud husband, father, personal trainer for more than 15 years, and an elite Master’s Track & Field athlete.

Erin Stern

2x Ms. Figure Olympia / IFBB Bikini Pro

After just missing being a high jumper at the 2008 Beijing Olympics, Erin switched her sport to bodybuilding.  She won the Ms. Figure Olympia twice and now has her pro card in the IFBB Bikini Division.

Eric Todd

Strength Athlete / Fit Dad

Eric is the proud father of two kids, a special education teacher, and a coach of wrestling and track.  He's competed in a variety of strength sports for 20+ years.  In 2021, he was inducted into the USAWA Hall of Fame.

 

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