Here’s a riddle: three people go out on a bike ride. One of them is me, a lifelong runner and fairly avid cyclist. The other two are my daughter Avery and her boyfriend Matt, both casual bike-riders. Avery and I ride side-by-side, chatting for most of the climb, while Matt zips ahead. Somehow we’re all able to have a great ride despite our different backgrounds in biking, and no one thinks the ride is too challenging or too easy. How is this possible?