I was a swimmer in high school and have been doing it on and off for the last few years (am 27 now). For the last 18 months have been doing squad training 2 - 3 times a week (3k in an hour, pretty high intensity). Am finally feeling back into it so have added a couple of resistance sessions. Try and surf once a week as well.

Swam a 30s for 50 LCM (long course metres) free the other day, which is the fastest I've gone in years. Feels great so now my goal is to get back under 1:03 for 100 LCM.

Exercise is so essential for life.