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.
Get Up Situp is a multi-muscle exercise that specifically strengthens the core and upper body. This workout also improves the strength of the hamstrings, glutes, and hip flexors.
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.
Weighted Crunch is a powerful core exercise that primarily targets the muscles in your midsection, such as your abdominal muscles, lower back, and obliques.