I biked for 10 minutes hard!
Yesterday I used an upright stationary bike at my college's gym while I was back in town for our annual cross country alumni weekend (which was fantastic!).
I thought 10 minutes would be enough to cause pain if it was going to, but wouldn't cause me to be hobbling around for days after. The pain after the workout was minimal (no pain during, surprisingly), and was probably just I-haven't-done-this-in-forever pain. I plan on cautiously testing out a bike and a gym membership here at home. I would love to start doing something active!