Comment by n3k5

There's a problem with this proposal: As cooling down the entire fridge via this method is not feasible, you'd have to thermally insulate the can from the outside case of the fridge. As in a normal household fridge, the can would have to give off its heat to the surrounding air inside the cooled chamber. The more of that air you pump out, the more that process slows down.

Instead, you could just take an ordinary mini fridge and replace the electric motor with a hand crank. Or maybe an exercise bike.

It could measure how much work you have put in and show you an estimate of how much longer you need to pedal/crank until you have expended as many calories as the beer contains.