If you had asked me 5 years ago, when I still lived in San Francisco, if I'd ever consider running, I'd tell you there was no way. I was too big-framed, I would say, and besides my knees were hosed from multiple cycling injuries. Running was heavy on the ... everything. You heard of knee injuries, shin splits, chronic pain, plantar fasciatis, etc.
When I started working out at the UCSD gym, I soon realized I had to do something about cardio. They only had a single spin bike in the workout room, and all the other cardio equipment involved some form of running. There were the elliptical trainers, the treadmills, and some strange self-powered treadmill that had the sad disadvantage of not keeping you on constant speed.
I ran, reluctantly. Initially, I could make 20 minutes at 6.7 mph (a 9 minute mile) and felt all proud of it. I was sure the entire gym was thinking I was a big stud - a feeling strengthened when one of the girls at the coffee shop asked me if I was the guy that did "all that cardio."