All of these are bodyweight exercises. Do three rounds. Note: make sure you're engageing your core during the plank variations.
- 20 to 25 Plank rocks (like a body saw)
- 20 Tabletop step-outs (10 each side)
- 20 Plank knee drops (plank knee taps but with both legs)
- 20 Plank ankle taps (10 each side; plank pike-ups with something extra)
- 20 Belly heel lifts (half Supermans lifting your legs)
- 20 Belly chest lifts (half Supermans lifting your chest similar to this hyperextension exercise without the twists)
- 20 Supermans