Appreciate the cold, hard facts on ice baths ;-) My last dunk was at 60 degrees: enjoyed that for a few mins at a time. One before that was at 36 degrees: be damned if I could last more than 30 secs! Whatever the ideal temp, one thing I know for sure: cycling through plunge pools and saunas a couple times each wk should keep me around 'til I'm 100 at least. Thanks for the science behind the pleasure!