If you've ever read any of the genre of "Men's Fitness" magazines, you'll recall that there are usually articles showing how a former slob has managed to turn themselves into a bronzed adonis of fitness, usually by ditching the burgers and kebabs, and slaving away at the gym 5 days a week. Personally, I've been suspicious of the authenticity of the articles in these magazines ever since the magazine Men's Health did a "review" of various online clothes shopping sites, notoriously publishing an article about how good boo.com were at delivering on time -- 4 months before they launched. [ and I should know, I was the technical manager at their ISP, unfortunately ].
Even more laughable are the set of advertisements advertised in various magazines for the "Body for Life" fitness challenge, which show obviously fraudulent before and after photographs. (Well I have no proof that they are fraudulent, but really, you'd have to have the intelligence of a vacuum cleaner to believe their authenticity).
In the spring of 2004 I eschewed the use of my Car in favour of a bike, and finally two years later as hamgray mentioned, did a Charity Ride for nofear.org, where we zoomed across East Anglia, covering 200 miles in 4 long^H^H^H^H short days.
So I present a photograph of me as a motorist, and one after my conversion to cycling:
