Crunch
Crunch is a classic core exercise that explicitly trains your abdominal muscles - part of your core. It also includes your oblique muscles on the sides of your trunk and the muscles in your pelvis, lower back, and hips.
Foam Roller Reverse Crunch with Medicine Ball is a classic core strengthening exercise that primarily targets the hip flexor and lower abdominals.
Crunch is a classic core exercise that explicitly trains your abdominal muscles - part of your core. It also includes your oblique muscles on the sides of your trunk and the muscles in your pelvis, lower back, and hips.
Swiss Ball Reverse Crunch is a core strengthening exercise with an emphasis on lower abs. Performing this exercise on a Swiss ball increases the difficulty level of the move.