If you hate crunches with a passion, and the idea of doing sit-ups fills ... left knee up to hip height. Pause, then go straight into the next rep. Complete all the reps on one side before switching ...
Plus, your shoulders, triceps, biceps, lats, traps, erector spinae, quads, glutes, hamstrings and calves will also be fired up. Side bends ... in a way that sit-ups and planks cannot do ...