Sprint/Run/Stairs
Repeat of interval #1: 20 seconds going hard, 10 seconds walking “rest”. Again, High knees would be a good alternate if you’re cramped for space. Repeat 8 times and move on immediately (during your final 10-second rest) to the next exercise.
Sit-Ups
Soles of your feet together with your knees spread wide (this eliminates the hip flexors and focuses mainly on the abs). As many as you can do in 20 seconds and then rest for 10. Repeat 8 times and move immediately (during your final 10-second rest) on to the next exercise.
Air Squats
Back straight, chest out and drop your butt to the floor. As many as you can in 20 seconds followed by a 10-second rest; repeated 8 times.
Congratulations! I was a sweaty mess after this one and I expect no less from you!
