Burpees and lunges with a twist will bring on a big-time burn.
- Do 40 seconds of burpees; rest for 20 seconds; then do 40 seconds of lunges, rotating your torso 90 degrees in the direction of your forward leg at the bottom of the move
- Rest 20 seconds
- Repeat for 8 minutes, and rest 1 minute
- Continue for another set – or rest longer.