High Performance CrossFit^®

Jak Cornthwaite started training at CrossFit JST in its Compete Classes, later joining the coaching team in 2015. Over the years, he has coached athletes of all levels, from class members to Regional, National, and Games-level competitors.

In CrossFit, he was on a Regionals (Semi-Finals) team in 2014 and 2015, then qualified for the CrossFit Games in 2017 & 2019, marking the first British team to do so. He also competed individually at Regionals in 2016 (15th) and 2018 (7th), finishing as the top-ranked British male in both seasons.

Jame is Head Programmer at JST Compete, primarily working on the main track of JST Athlete. Alongside this Jamies is also Master Coach at CrossFit Shapesmiths - one of Europe's biggest CrossFit gyms. Jamie has worked for a decade with athletes of all levels - from those just starting their athletic journey all the way to athlete's who are competing at the highest levels of the sport.

Ella started CrossFit in 2016 and has as an individual at CrossFit Games Semi Finals twice. Ella started coaching in 2020 then took a short break to complete university and returned coaching in 2024, starting with JST Compete as an individual coach in 2025.