Crunch

Crunches are a type of abdominal exercise that can strengthen your core muscles. Here are the steps to perform a crunch:

• Lie on your back with your knees bent and your feet flat on the floor. You can place your hands behind your head or cross them over your chest.
• Lift your head and shoulders off the floor by contracting your abdominal muscles. Keep your lower back pressed against the floor and avoid pulling on your neck.
• Hold the position for a second, then slowly lower yourself back to the starting position.
• Repeat for the desired number of reps.