[rthomas6]

Lift heavy weights. Not for strength or physique (though that's nice too), but because it increases independence and mobility into old age, decreases likelihood of falls, and increases bone density. Basically it prevents you from sitting in a recliner slowly dying for 10 years at the end of your life. Instead you get to live those years doing things. It also improves cognition and mental health in old age.

Edit: Do squats, deadlifts, bench press, and pullups.

There are a million programs to choose from on /r/fitness, but basically just start with something you can do and try to increase weight or reps every session/week/whatever.

[is_true]

interesting, do you have any recommended source to read about this?

[hc91]

Mark Ripptoe - Starting Strength ;) https://www.amazon.com/Starting-Strength-Mark-Rippetoe-ebook...

[tjt]

Dan John is less dogmatic and a bit more of an essayist. He's got lot's of great advice and stories about staying in shape as you get older. http://danjohn.net/