Harley Motorcycles and the Fat Guys Who Love Them

While I was stuck in traffic this weekend on the Jeresey Turnpike I saw numerous motorcycles pass by as they weeved in and out of traffic around me. I guess I have no problem with motorcycles. But what is the deal with fat guys and motorcycles? Every guy I saw ride by me on a Harley looked totally out of shape and had a huge gut. Did Cardiologist around the country start prescribing riding a motorcycle as a way to avoid angioplasty?