I definitely went on this journey with my running. At first I would run very short distances at very high pace(zone 4/5), but I fell out of it. I picked up running again last year and ended up more in zone 3/4, but for the last six months I've been aiming for zone 2 in most of my runs.

I've had some knee pain recently so I've not been running much, focusing instead on knee strengthening exercise. On my last run I discovered this weird phenomenon were my knees stopped hurting if I ran faster with longer strides, it felt like I was "rolling through" each step which seemed less demanding for my knees. Perhaps my slow running style is just poor.