the best flexibility exercise could possibly be the calf stretch….it may even be the best overall exercise ever. there are different ways to stretch our calves. i like this one(found through aligned and well) and also like it barefoot. you can roll a towel, use a half dome or like a friend of mine use a small, concrete pig statue; something that doesn’t move under your foot. place top of foot on object, keep knees and hips over ankles. leave heel on ground as in picture. walk opposite foot even or slightly ahead of dome/towel/pig. you will know where to place opposite foot by the amount of stretch. repeat opposite leg.  give it a try several times a day and  be your own judge. let me know if you think it’s the best.  check out 5 simple ways to avoid back pain at if want to read more about this stretch.