Lazy may not be the right word. When you are 70/80 and if you still work out as you were 50/60, your body may never get enough rest and recover. You will feel tired 24/7. That's not good feeling.Old people are simply lazy,
I did my 4 miles running on the beach yesterday. Today, I tried to run on the beach again, I found out that my body just didn't want to do it. Today, I just did walking and enjoy the ocean view.
Lazy is your body can do it, but your mind doesn't want to do it. IMO, if your mind wants to do it, but your body can't, that's not lazy.
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