Short, powerful bursts that add up to the same burn rate as a HIIT session.
Tennis packs sprints, lunges, and full-body swings into short rallies separated by brief pauses to reset. The power needed to generate racket speed, combined with the lateral movement to reach each shot, pushes the per-minute cost well above sports with more continuous, steady movement.
At 8.0 MET, tennis matches HIIT and moderate-pace cycling for calorie burn, despite the long pauses between points.