The Sufferfest Training System Cycling and Triathlon Workouts The Sufferfest is the most effective training app available for time-crunched cyclists and triathletes, giving you everything you need to get stronger, faster and tougher. ** Exclusive to The Sufferfest, Four-Dimensional Power (4DP™) measures your complete power profile to determine your Rider Type, identify your primary area for improvement , and personalize the power targets in your workouts to 4 metrics (not just FTP) for the most effective training anywhere. Find out more here: https://vimeo.com/238124644 REQUIRED EQUIPMENT * iPhone: 5s, 6, 6 Plus, 6s, 6s Plus, 7, 7 Plus, 8, 8 Plus, X, Xs, Xs Max, Xr, 11, 11 Pro, 11 Pro Max * iPad: iPad Retina, Mini, Mini (Retina), Air 2, Pro or newer * iOS 11.4 or greater https://apps.apple.com/us/app/the-sufferfest-training-system/id917325169?mt=8