cycling again, doctor, what would be the thing that you sort of tell them to be mindful of? >> i think the first thing is be mindful of your current injuries. make sure those are addressed and make sure you have some basic core stability, good range of motion. and then go to a proper bike shop. get fitted for a bike. >> you know there are cars passing by us. the interaction of bikes and traffic, first of all, we're going with traffic which is how you should ride, right? >> yes. >> what else? >> bikers need to be alert. we're totally unprotected. running red lights is not a good idea. stop at a stop sign. as you're riding, you want to be watching the cars. you want to try to get a feeling are they going to turn? are they indicating? watch for doors opening. it's a great sport. you see some beautiful things you never noticed in your car and getting exercise as well. >> you notice the hills more. >> yes, you notice the hills. you definitely notice the hills