Sir Chris, like Robert Förstemann, is an explosive weightlifter on wheels. Förstemann demonstrated his ability to power a toaster just long enough to make one piece of toast. That is a lot of energy to generate.
When I trained, my best peak power was about 1100W, but that wasn't sustainable over several minutes; 300-400W was my absolute limit. My counterpart, Ken Buckley, was good for over 1600W peak.
The average human is happy generating 50-100W continuously. That's why the electric assist limit of 250W is fairly sensible for non-heavy duty applications, and why all those chancers haring around on their illegal 4kW 'e-bikes' are really riding bicycle-type-motorcycles.
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