HOW: Get set-up standing. On the side you want to perform the exercise, balance on that leg and lift the other foot off the ground. With the arm on the same side as the leg on the ground, reach across your body away from the leg on the ground as far as you can as you perform a hip-hinge, return to starting position followed by reaching forward, then return to starting position followed by reaching out towards the same side of your leg on the ground. That counts as 1 rep, repeat.
FEEL: You will feel your hamstrings, glutes, and even your calf and arch of your foot muscles working with this exercise. Your core muscles will be working a little bit as well.
COMPENSATION: Perform a strict hip hinge, do not arch or round your back. Follow the video for tips and details