Interesting but I am not sure if you are going to save the planet! The maths doesn't quit hold up

Say there are currently 3,000,000 currently unemployed in the UK

if they are doing 1 hour a day then that is 125,000 cyclist per an hour

if each cyclist can output 100watts then that is 12.5MWatts

Drax (the UKs largest power station) put out 3870MWatts

More than 300 times more!

So what if every man woman and child in the UK was press ganged into action for 8 hours a day

Total output would be about 240MWatts still less than 10% of Drax

But at least the population (which some may call slaves) would be fit!