Optimal sets and reps: 3 to 4 sets of 15 to 30 reps As you come up in the traditional sit-up, twist your torso toward one side, bringing the opposite elbow toward the knee on the twisting side.

The corkscrew exercise is performed lying on your back with your hands placed on the floor next to your hips or behind your head for a more challenging variation. From here, you’ll softly bend your ...

Sit-ups have seemingly been a staple in our training ... Lift your torso off the floor and twist to face one side as you simultaneously bring the opposite knee inwards to meet your elbow.

The main difference between sit-ups and crunches is the range of motion involved in each exercise. Sit-ups require you to lift all the way up, while crunches require a slight lift off the ground.