There's a reason elite athletes swear by the post-workout ice bath — it works. The cold temperature constricts blood vessels, which reduces swelling. And when you come out of the bath, your body warms up quickly, improving circulation, which also helps with the healing process. Because I am not a fan of shocking cold temps, I only use ice for the times when I have a strained muscle or serious injury. Occasionally I am inspired to take a cold shower post-workout, which is said to help the pain causing inflammation.