"To move all significant health markers in the right direction, do more work faster, trainers say. The only way to know intensity is to experience it. It is not a mythical creature born of grunting loudest, sweating most or cheering excitedly. It is also not a matter of opinion. It’s physics. Scientifically speaking, intensity is defined as power: force multiplied by distance, then divided by time. Simply put: Intensity is doing more work faster." (CrossFit Journal, 2016).