Exercise Cube- add lots of fun exercises- jump, spin, hop, jumping jacks, bend knees. Take turns spinning but everyone moves.
Great field day snack - gelatin orange wedges! Awesome idea and recipe from quick-dish.tables...
Very simple, quick computer-based demos that would be great for introducing a topic while engaging kids in the decision-making process. I like to have my kids do quick "explore" sessions on the computer and use that to springboard our lessons. I especially like the friction and mass tests using the model car.
Face painting is fun, but even easier, get ahold of some temporary tattoos and quickly apply on cheeks and arms for picture time!
Chill stations give kids a chance to do fun activities that require less physical activity - bubbles, face painting, hula hoops, chalk drawing, and cup stacking are great ideas!