Every time the whistle blows (or trainer calls switch) switch to the other movement in the pairing.
Crab Walk & Bear Crawl
Squat thrusts & Box Jumps
Push ups & Sit ups
Jumping From Plate to Plate: We have played this a few times as a game. This should be a simplified version. Lay a myriad of plates out on the floor and have them traverse from one side to the other only jumping on plates. To make it shorter for skill work you could go from one thin white line to another. Each time take away a plate.
2-3 Pulls Up Rope ( for new athletes have them just try 1)
3 Squat Cleans
6 Push Ups
9 Sit Ups