I’m going to attempt to step through many of them. Now, there’s a lot of concepts behind the whole 4DP thing, as well as some marketing claims made. Oh, and before we get too far along, I totally get that The Sufferfest gets all bent out of shape when it’s shortened to Sufferfest (sans ‘The’), but because I think writing The Sufferfest over and over again is annoyingly pretentious (like saying ‘The DC Rainmaker” or “The Google”), I’m shortening it to just ‘Sufferfest’ for the remainder of this post. Said differently, it’s becoming more like a coach than just an app with exciting videos and workout targets. All of which is then used with their included training plans and videos to give you more specific targets for workouts. This 4DP profile is generated after you complete a 60 minutes of fun called the ‘Full Frontal’ test. The main change was shifting to something they call ‘4DP’ – for Four Dimensional Power – which essentially defines your cycling power profile into buckets. In doing so it’s become quite a competitive indoor option to leading apps like TrainerRoad and Zwift. The platform has been around for a number of years, but has really honed its focus in the last 1-2 years and reinvented itself. Earlier this week The Sufferfest rolled out a pretty significant change to its indoor trainer app.