On Sunday, November 22, 2020 at 2:57:46 PM UTC-8, James wrote:
https://www.cyclingweekly.com/news/p...ost-476421/amp

What will they think of next?

At a guess I think that this is similar to pedaling circles. It stores energy in the springs from the downstroke on the pedals and releases it as you ease off over the top and under the bottom of the stroke. It give you NO increase in anything.