About the Gym
Jimmy's Gym has a distinct identity in Utrecht: a raw, authentic old-school boxing gym, the kind of place where the walls carry posters of legends like Ali and Frazier and the warm-up runs to soul and funk. Members describe it warmly and repeatedly as a place with no arrogance and no nonsense, where beginners are genuinely looked after and the group energy is high. Boxing is the heart of it — described by the gym as the most honest sport there is — but the offer is broad.
Alongside boxing, the gym runs Thai kickboxing under Walter Janssen, a 5th Dan black belt and A-level kickboxing trainer; MMA and grappling sessions under UFC-based rules; CrossFit-style strength and conditioning; and private one-on-one coaching. There are also group clinics for teams and companies. Pricing is straightforward and affordable, from an unlimited monthly pass down to once-a-week and youth options, with a free trial lesson available. One cautionary note appears in reviews about an auto-renewing membership, so it's worth checking the contract terms — but on the training itself, the verdict is overwhelmingly positive.
Class Schedule
Contact gym for current schedule
Pricing
Trial Class
One-time
Unlimited
All classes
10-Class Pack
Valid 3 months
Head Coach
Walter Janssen
Walter Janssen leads the Thai kickboxing programme at Jimmy's Gym as a 5th Dan black belt, A-level kickboxing trainer and former international referee, with decades of experience teaching men, women and youth for fitness, discipline and competition.