The list of various metrics for training control and training optimization is growing. Each generates different values that need to be correctly tested and interpreted in order to control, monitor and optimize the training. A very valuable parameter: the body feeling of the athlete, which is “calibrated” during exercise and experience. The Borg scale or RPE comes close to it, serve the subjective assessment but can also be misinterpreted in the absence of experience and thus mislead. In competition, athletes sometimes cover their Powermeter with tape, not getting irritated by data, but then used afterwards for evaluation. A mix of objective facts/ data through technology and subjective feeling seems like a good approach. etape3 offers sports coaching and training for athletes of all level – ask for more information.