Tumbling. Handstands, forward rolls, back straddle rolls, cartwheels, round offs….
Hurdle. Turn the mat on its side in an accordion style to keep it from tipping. The kids start at one end with a running start to jump over the mat.
Nerf War. Grab some nerf guns and set up barriers with the mats. The mats make perfect barriers.
Tunnels. Unfold the mat with peaks at each fold. Crawl, jump or slither through the tunnels.