Exercises from the community
Bicycles (abs)
Bicycles on a hanging bar work endurance and hypertrophy for the abs through a longer range of motion than the floor version, recruiting the obliques as a synergist throughout. Hang from a pull-up bar with your arms fully extended and core braced. Drive one knee up and across toward the opposite side while extending the other leg, then alternate in a smooth pedaling motion, keeping your torso as still as possible.
Medicine Ball Side Planks
Medicine Ball Side Planks firm the whole midsection, with the added ball work making them especially effective for the obliques and overall core strength. Prop yourself up on one forearm in a side plank, hips lifted so your body forms a straight line, and hold or reach a medicine ball with your free hand. Hold the position, keeping your hips square and lifted, then switch sides.
Reverse Crunches (abs)
Reverse Crunches specifically target the lower abdominals by moving the hips and pelvis instead of the shoulders, filling a gap that standard crunches don't reach as directly. Lie on your back with knees bent and feet off the floor. Curl your hips up and in toward your ribcage using your lower abs, then lower back down with control, stopping before your feet touch the floor to keep tension on the muscle.