This challenging ab exercise makes regular sit-ups even harder! Start off with a four-kilogram soft medicine ball, and work your way up as you get stronger.
- Sit in front of a wall with the soles of your feet together and knees out wide. Play around with the distance your feet are from the wall; you may prefer to be closer than what's shown above.
- Holding the medicine ball at your chest, lean back and lie on the floor, bringing your arms overhead, tapping the ball on the floor.
- As you perform a sit-up, bring the ball in front of your face and throw it at the wall. As the ball bounces back, catch it at your chest.
- This counts as one rep.
Image Source: Sam Kang