The term currently used to describe the actions of an overweight, middle-aged guy who is running past your window (right now! look!) with a one-day fixation on solving his physical problems which have built up for many, many years.
Made even more repulsive by the wearing of a sleeveless T-shirt, or (God forbid!) no shirt at all. Made even more amusing if you live on a steep incline and he's going up the hill.
Look at the vacant horror in his eyes as he and you both realize that you'll not be seeing him try this again.