Foam rolling is everywhere. Athletes and fitness enthusiasts don’t leave the gym without it. But why? It hurts. Well, let’s see: It’s claimed to stop your muscles from feeling sore It increases the range of movement in your joints It helps your flexibility It’s a good warm up It loosens you up It can even get that niggling crack in your back Is it just another fad? Does it even work? If it does work, why? The explanations for why…