Crunches, also known as abdominal crunches, are a core exercise designed to target your abdominal muscles—specifically your rectus abdominis (the six-pack muscle) and your obliques . Perform crunches by lying face-up with your feet hip-width apart.
Crunches, also known as abdominal crunches, are a core exercise designed to target your abdominal muscles—specifically your rectus abdominis (the six-pack muscle) and your obliques . Perform crunches by lying face-up with your feet hip-width apart.