ProsourceFit High Density Foam Roller Warming up and cooling down are imperative to preventing injury and getting the most out of training sessions. Foam rolling is a great way to prep your muscles before a session and to alleviate any tightness you may be experiencing postworkout. Felix said she always has a foam roller with her, and we recommend the ProsourceFit High Density Foam Roller ($12). Image Source: amazon.com ProsourceFit High Density Foam Roller $12 from amazon.com Buy Now