Why don't you create a Bicycle powered power supply for a computer. That way you can peddle the power and have a UPS for backup just in case you fall behind, don't want to lose that data. Then just ride the bike to provide the power. Just a thought.
I'm getting larger as well. 7 Years ago I was like 185, now I am 270+ just about. But the last year I was sick and I was able to lose a few, gain a few, then I got really sick and lost nearly 50 pounds and then gained it back again. The trick, apparently, is to keep them off. I've tried brisk walking, watching what I eat, etc.