I too wonder if your muscles retain some memory. I'd also spent the last 19+ years carrying children and their paraphernalia around, so that might have helped. I definitely need to get my leg strength up, as I discovered on a couple of climbs that my daughter (single leg squats at gymnastics, girl) could do and I couldn't get my legs to move without some help from my arms.

I also think we gain stamina as we age. Youngsters manage the quick bursts well enough, but often struggle in the stamina department.

!ENGAGE 20