You guys got any clue as to how much those magnets attached to your wheels and pedals slow you down? You are foot-powering small generators. Heck, at our age (approaching 80) we need every bit of assistance we can get.

Throw away the magnets!!

As far as the various Apps and Garmins and similar - well, they all need recharging, using up MY electricity in the process and putting an extra load on the electrical system, requiring more generators powered by coal, or wind or natural gas or whatever!