Take five people and have them take off their shoes and socks. Take a marker and write a large letter on the bottom of each of their feet so if they sit facing you and hold their feet in the air, you can read the letters. On the first person put an A and a N (one letter on each foot), on the next an E and a T, then GR, OM, and SP. You will call out different words for them to spell and they have to cross legs, stretch, and situate themselves in a position so that the bottom of their feet spells the word you called. You can do this with two teams of five if you want and see who spells the word first.
Some words you can use are: GREAT, MASTER, ROAST, GRASP, SNORE, MENTORS, MORE GAS