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At CrossFit IV, NASM-certified personal trainer Archie Brown and fellow trainer Matt Cook introduce CrossFit's functional exercises to nearly all ages. Their CrossFit Kids program welcomes children as young as 3 and their adult program welcomes grown-ups as old as 147. Both programs revolve around CrossFit's daily workout. Depending on the day, the workout may include rope climbs, pull-ups, dead lifts, box jumps, or the tyke-size version of box jumps—hopping on a short stack of weights. With both CrossFit Level 1 and CrossFit Kids certifications, Brown and Cook know exactly what they're doing when coordinating classes.