About 3 Bros CrossFit

Welcome to 3 Bros CrossFit, Thetford’s first and only CrossFit affiliate, founded by Jack Bloss.

After 5 years in the Royal Air Force, Jack discovered CrossFit in 2015. He wanted to improve his fitness and very quickly became addicted.

He now competes at a high level, and his passion and determination drives him to continuously learn and develop his skills.

Whatever your fitness goals may be, Jack has the knowledge and experience to assist you in achieving them.

Named after Jack’s three sons, 3 Bros CrossFit boasts a clean, tidy and well-equipped box, priding itself on being a professional, family-friendly, community-focussed gym.