General Situp
General Situp is a classic abdominal exercise that strengthens and tones the core-stabilizing abdominal muscles. Situps work the rectus abdominis, transverse abdominis, obliques, and your hip flexors, chest, and neck.
One-Arm Full Situp strengthens the core by emphasizing obliques and lower abs. Using one arm to do this exercise also provides muscular balance on both sides of the body.
General Situp is a classic abdominal exercise that strengthens and tones the core-stabilizing abdominal muscles. Situps work the rectus abdominis, transverse abdominis, obliques, and your hip flexors, chest, and neck.
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.
Russian Twist strengthens your core, obliques, and spine. It's a total core exercise that also works your balance, builds stability in your spine, and trims your mid-section all at once.