Parents who enroll their children in gymnastics or cheerleading hoping to burn off some excess energy often find that their youthful exuberance remains in never-ending supply at home, in the yard, and even inside the house. Short of padding some walls to keep both your Olympic hopefuls and the antique china safe, maybe a home tumbling mat is in order. These oversized runways are specifically designed to absorb those round-offs, cartwheels, backflips, and other maneuvers that are best performed with the aid of a padded surface. An inflatable or foam “spotter” gives parents some peace of mind and youngsters a space to practice with confidence. Here are three ways to use them.