For me, even though I have gained muscle tone and definition commensurate with a man 63 years old (certainly not "ripped" like a 20 something), the real payoff is better functioning "innards" like heart, lungs, ect.
As an example, in 2005 I fell off the trailer of my tanker truck and shattered my hip requiring a partial hip replacement. Since it's a workers comp issue I have the hip X-rayed once a year to make sure the prosthetic femur is still properly affixed. After my last X-ray the first thing mentioned to me was there was significant bone growth and thickness around the prosthesis which made the hip much less likely to dislocate. They said this was directly due to regular exercise and to keep it up.
I have slight hardening of the arteries but that's a gift from Adam and Eve....comes with age. My vital organs are doing as well as they can be for my age. Just wish my brain would quit rotting away
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I believe you would benefit starting slowly with some type of exercise that may suit you. Walking, jogging, biking or some indoor gym stuff. Man, medical bills alone are enough to keep me motivated even when exercising sucks when I don't feel like it.
Anyway, please give it some thought. It can also be a great natural counter measure to depression.