Why did you start running with power? Based on feedback from runners using power, here are the top 4 reasons: 1) It’s just one number, that represents your effort whether you’re running on the flat, up or down hills, or on windy days; 2) Pace and hart rate weren’t working, whether it was because of pace issues on hilly routes, heart rate lags when starting or stopping intervals, or not being able to accurately judge effort, runners were having difficulties using other methods of measuring how hard they were running; 3) Training that works – Many non-power plans come with a risk of overtraining or leaving potential training gains unrealised, while power uses narrower target ranges within zones, and the target ranges are individualised – they’re based on your measured fitness.; 4) Better race results – While power canโt guarantee better results or a qualifying time, race planning with power uses your current fitness, stamina and running effectiveness to determine personalised race targets … targets that you should be able to maintain for the entire race – just ‘run to the number’.