This practice is dedicated to the back of your legs! Hamstrings are often asked to open and stretch in most yoga classes today, but before you can create length in a muscle, you need the muscle to understand how to engage. Expect a heavy dose of one-legged balancing, use of blocks and poses like ardha hanumanasana, parsvottanasana and standing splits as you practice creating stability and strength in your hamstrings. Props Needed: Two blocks.