Went to a clinic given by Anthony Ervin a few months ago and he swears by foam rollers as part of his warm up before training. Today, my yoga instructor also recommended getting one. Seems like it's time to invest in one. She (yoga) said that I didn't need to get a long one and Anthony Ervin didn't say what kind he would recommend. Anyone have experience with foam rollers and can recommend a type to get and exercises or videos to follow? Thanks.