Relays and team games build agility, coordination and teamwork. Here's what children gain when fitness is built around play.
Watch children in a playground and you'll see them doing what fitness coaches design programs for: sprinting, dodging, balancing, climbing, and cooperating. They don't call it training. They call it playing.
Drills are repetitive and individual. Games are social and varied. A child who would resist 'ten sprints' will run happily for 40 minutes if there's a game to win.
The long-term gain: children who associate exercise with fun are more likely to keep moving as they grow. The habit matters more than any single skill.