Exercise 4 Modification: Crunch Hold With Bent-Leg Toe Touch
To modify Exercise 4, you'll simply bend your legs to reduce the strain on your abs and hip flexors. Here's how.
Start lying on your back with your feet lifted and legs bent at a 90-degree angle, knees directly above your hips. Place your hands behind your head, elbows wide.
Curl your upper body to lift your shoulder blades off the floor, engaging your abs and keeping your lower back flat against the floor. This is your starting position.
With control, lower your right foot until you can tap the ground with your heel. Make sure your back stays pressed against the floor and keep the 90-degree bend in your knee.
Lift your right leg to return to the starting position. Repeat with your left leg.