From Zwift to TrainerRoad, most of the popular training apps center around your Functional Threshold Power (FTP), or the maximum power you can sustain for one hour. But The Sufferfest claims FTP isn't ...
The Sufferfest offers an ever-growing catalogue of entertaining training videos, and the new 4DP system tailors them to your physiology. There are also the extras, such as mental training and yoga, ...
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