How to Do the Inchworm Exercise Proper Form, Variations, and Common Mistakes By Laura Williams, MSEd, ASCM-CEP Targets: Total Body Level: Beginner The inchworm exercise offers a little bit of everything—it helps strengthen the muscles of your anterior chain (the front half of your body), while stretching the muscles of your posterior chain (the back half of your body). And because it targets your entire body in some capacity, it gets the blood flowing. This makes it an excellent move to incorpor