Do you need help with your sit-ups? Assist your abs with resistance bands.
Anchor the band at the bottom of the door. Grip the handles, or the band itself, and lie on your back, with your feet 3 to 4 feet away from the door. Your feet should be flat on the floor and knees bent. Also bend your arms, with your hands together, above your hips.
Start with your shoulder blades a couple of inches off the floor.
Exhale and contract your abs, raising your upper body until it´s perpendicular to the floor while keeping your head and back aligned.
Inhale and return to the starting position. Repeat.