Whistle Drill: Every time the whistle blows (or trainer calls switch) switch to the other movement in the pairing.
Crab Walk & Bear Crawl
Squat thrusts & Sit ups
Stink bug push ups
AMRAP in a given amount of time of
10 Kettlebell swings
Inverted Bear crawl (feet on parallel lines boxes, hands on floor)
10 Lunge steps