What regrets do you have about your 20s and 30s with regards to health and fitness?

My big one is I didn’t do a half marathon, much less a full marathon. Was in California then, no kids, great weather and I actually ran everyday. I dreamt about how I would do the Big Sur marathon at least once and never managed to cross a 4 mile run. Looking back feels like lost an opp.

Meanwhile a colleague of mine went from chain smoking to running marathons to Ironmans and ultramans all around the same time 😆