Against my better judgement, I agree to go along with Orla and my brother and his boys for a family run. They’ve all been very busy with new projects at work and we haven’t had dinner at my house for a few weeks, so I’m eager to spend time with them. I just doubt it’s a good idea for my joints to run on the paved trails they prefer for the weekend morning long runs.

”Doesn’t this kill your knees,” I ask my brother, who is practically ...