So ... as I watch a dear friend, who is in her early 70's, struggle with limited mobility, I am even MORE motivated to try to 'do better'. My son (who seems to know everything about everything - not being snarky, he really does!) says that because our society is so incredibly sedentary we tend to have difficulties with specific tendons/muscles literally shortening from not being used. The ones I'm talking about are the ones engaged in our pelvic area, glutes, hamstrings, lower back, etc. Taking them out on vacation once or twice a year for a week of diving won't cut it. One of the easiest things he has suggested to begin with are lunges. They're not hard to do. They DO hurt like hell the day after, but I think I will be happy to have done them when I look backward and realize all the time and pain has resulted in better mobility.
I've turned a corner (I hope it's permanent) in terms of exercise. Rather than a constant internal monologue about how much I HATE exercising, I've started to use that exercise time to listen to podcasts, talk to friends (you know who you are), or listen to my own thoughts. When those thoughts turn to "I fricking HATE this" I remember my dear friend whose lack of using her muscles has resulted in atrophy that will probably be permanent, and I think 'This is totally worth it' - not just for diving, but for living.
Ahem ... putting soapbox away ...