So ever since I started going for the splits, my hamstrings and hip flexors started to feel nice and loose. And as a result, I started to feel that the most tense area in my lower body were actually my calves. So I started doing calf stretches and looking for something that could help me stretch it out really deep, and I find this to be the most effective stretch! I also foam roll my calves as well, which is very important, but this requires just a tree. So enjoy!