They connect directly to the heel bone, which gives us the connection of our «glutes» and upper hamstrings through the balls of our feet (where you need to be if you want to move most athletically). (weckmethod.com)
Placing your feet higher will help you focus more on the glutes and upper hamstrings and enable a stronger contraction in these muscles due to the increased degree of hip extension and flexion and the reduced range of motion around the knees. (fitnessandpower.com)
This move strengthens the back body (trapezius, spinal extensors, glutes and upper hamstrings) to improve posterior torso stability from head to hips. (mindbodygreen.com)