3 rounds warm-up For Time For time:50 Box Jumps, 24″/20″. (substitute step-ups)18/12 Calories, Air Bike 2 Intervals, each for time:75 Air Squats15/10 Calories, Air Bike 3 Intervals, each for time:15 Pull-ups12/8 Calories, Air Bike 1:1 to 1:2 Work-to-Rest Ratio Workout provided by CrossFit Linchpin