miners that takes energy from physical exercise? i don't think it's possible....you need a very big amount of energy, you cannot do it with a bike.
if you're interested in finding a way to mine some coin from physical activities you should check out Mangocoinz!
I'll show you guys what I mean when it's done... It's not running the miner directly from it.
It's storing power in a battery bank for later then switching back to your home electricity.
Or just chipping off cash from your monthly home electric bill.