Most men perform the inchworm as a warmup exercise. The move stretches your calves, hamstrings, and thighs, while preparing your muscles for just about any activity. But throw a towel under your feet while you do it, and suddenly the inchworm becomes a grueling core-strengthening move called the inchworm slide. "Sliding the towel to meet your stationary hands activates your abs, hip flexors, and obliques," says Jack. "You'll finish feeling stronger and loose."
Trainer tip: You know planks, right? It’s easy to go through the motions here. Don’t do it. “The key is to squeeze your entire body—quads, glutes, core, back, and fists—as tight as possible while taking diaphoretic breathes throughout the hold,” says Wealth. No matter how many times you’ve done it, this exercise is as difficult as you’re willing to make it.
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But instead of just trying to perform as many reps as possible, slow down and really focus on the quality of the movement—especially the eccentric, or downward motion, of the exercise, he says. “The eccentric contraction is the most important phase when sculpting any muscle.” Plus, focusing on quality over quantity will help protect your back (some experts say crunches can be potentially troublesome for guys with back issues.)