The Endorphin Trainer brings the energy of the Endorphin race series to your workout days. A nylon plate embedded in PWRRUN PB foam delivers a propulsive, fast-feeling ride that's built for tempo runs, threshold sessions, and any day you want to push the pace. More durable than a race shoe but faster-feeling than a standard trainer, the Endorphin Trainer is the missing piece in a serious training rotation.