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Leonard was working with a medicine ball, doing drills for his recovery process from a right knee injury that has kept him out all season.

In the early years of his career, chasing vans and running up hills or throwing medicine balls while singing to improve his breath control were not wasted on him.

Each person has their own designated station where a screen masks sensors that track both the motions of the exerciser as well as the gym's specially built equipment, including dumbbells, medicine balls and skipping ropes.

So Brad Roy, who works with Gates and is the editor of the American College of Sports Medicine’s Health & Fitness Journal, suggested medicine balls instead.

Music blared - “She Blinded Me with Science” was among the selections - as the Maple Leafs warmed up for their workout by playing some spirited indoor soccer and tossing a medicine ball into concrete walls.