Best $20 I've spent this summer.
Thank you, Facebook Buy/Sell/Trade.
The attached timer is my favorite. It counts up for how long you've been jumping AND counts your number of jumps. So easy for everyone to take 5 minute turns. And then compare who jumped the most.
Perfect way to burn a little energy. (Since our real trampoline ended up out in the wheat field.)
These little people have a lot of energy some days.
This one, in particular...