Bicycling magazine has linked up this 2005 cover story on "plus size" bikers:

At this point in Sam's life, 39 years old, easily 200 pounds overweight and having trouble breathing, if something doesn't work for him soon, he's not going to be around much longer. He's tried everything to lose weight, a kabillion diets and powders and pills (including Fen-Phen, on which he lost 100 pounds before the substance was banned, then Serzone, which a doctor prescribed to replace Fen-Phen, but which ended up killing Sam's libido and, he says, making him apeshit, thus he had to stop taking Serzone and gained back the 100 pounds, et cetera, et cetera).

To make a gigantic story small, Sam has come to cycling as his last-ditch effort.

He knows, from reading this very magazine, that there is no better form of physical activity for weight loss than cycling. Incinerating fat is one of the principal benefits our sport provides. Ask any group of cyclists, of any size or skill level, if they know someone who has lost significant weight through riding, and the universal answer is not Yes, I know someone, it is Yes, I know GREAT NUMBERS of people who have dropped GREAT NUMBERS of pounds. And it's simply true: If a person pedals for an hour a day, four to six days a week, and avoids sandwiches with five pounds of fixings, weight vanishes.

I'm happy to see anyone out there. Sure, I'll give a second look to that much spandex, but only because one doesn't often see that sort of thing. If you're out there and huffing, you're out there and trying, and that's really all that matters.

So what's stopping you?