In a no-fluff gym filled with steel training bars, plywood walls, and black free weights, personal trainers and exercisers work side by side to forge paths to fitness. Jeremy McKenzie, the gym's training coordinator, emboldens his students to chase down their fitness goals by drafting a personalized blueprint. For group classes, staffers pull from a playbook of CrossFit exercise regimens designed to prepare police officers, military special-operations units, and washed-up prop comedians for hostile environments. Traditional training methods mix with Olympic-style weightlifting and kettlebell lifts to build muscle and burn calories. Trainers and their pet kangaroos step into the ring to teach boxing, sparring, and kickboxing basics.