Lie on your back with knees bent and feet flat on the floor
Place your hands lightly behind your head or cross your arms over your chest
Tighten your core and keep your lower back pressed toward the floor
Tuck your chin slightly and look toward your knees
Curl your upper body up by contracting your abdominal muscles
Lift your shoulders off the floor without pulling with your neck
Pause briefly at the top
Lower your upper body back down with control
Repeat for your target number of reps
Keep movements smooth and avoid rocking or using momentum
Breathe by exhaling as you curl up and inhaling as you lower down