IMO, the best way to spread the word is by keeping at it and surprising your co-workers with how much weight you've lost. I was becoming a chubby since I started working for my company 1 yr ago and despite dieting I gained 12 pounds . I started to commute, do solo weekend rides and workout about 6 months ago. 10 pounds later I started getting comments regarding my overall thinner appearance and one lady, who had a gastric bypass done, was asking what diet I was on. Of course I told them all that its all the cycling I've been doing. 2 weeks later at least 2 of my coworkers, females, bought bikes and started riding to work too.

What strikes me funny is there are always at least 10-15 bikes on the bike racks right outside the building. So I am not the only one doing this in the whole hospital. But apparently, I'm the first in our service that they know of to bike commute.