Anyway, I've got an idea for a smart-contract based cryptocurrency.
The idea is to load mining software into the treadmills/bicycles at various
gyms (obviously with their permission...). As you exercise, the mining
software runs and mines "coins" which you can then redeem for rewards.
Since it's smart-contract based, your performance will be recorded in the
blockchain and you can then track it via an app or browser.
I'm thinking of calling it "ActiveCoin" or something.