Power Endurance is mostly your ability to sustain muscular contractions at a medium to high intensity with limited rest. The feeling is quite unlike that of a typical endurance burn where you can rest or shakeout mid-climb as the intensity of climbing is at a level where this is impossible. The feeling upon reaching the most intensive bout of a power endurance focussed exercise is that of complete muscular failure without much sensation of a forearm burn akin to high-end endurance training. Instead it has often been described as a feeling of a “lack of power” upon failing or reaching the end of a set.