Is this the hardest test you can do on a bike? (video)

Despite being only three minutes long, the critical power test could well be the hardest physiological test you can do in cycling – but why should you put yourself through the pain?

There are a number of physiological tests that you can complete on a bike, such as VO2 max, lactate threshold and functional threshold power tests.

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Paul Knott is a fitness and features writer, who has also presented Cycling Weekly videos as well as contributing to the print magazine as well as online articles.  In 2020 he published his first book, The Official Tour de France Road Cycling Training Guide (Welbeck), a guide designed to help readers improve their cycling performance via cherrypicking from the strategies adopted by the pros.