Sometimes you forget. 2 miles IS a big deal
My very nice neighbor across the street has developed severe gout, so he has had to give up his treadmill and walking.
Instead, he is doing some bicycling.
He is about 4 years younger than I am. I talked with him this morning. He is proudly up to 2 miles bicycling at a time, for which it takes him a significant amount of "recovery time."
So, I told him to just keep adding a bit each day, and he is doing that.
He is amazed at my and my wife's 10-20-30-40 mile rides.
Last year I led a neighborhood "group ride." He participated, and we went 5.5 miles, at which time he nicely excused himself. He never said anything, but I would imagine that I almost killed him with that 5.5 mile ride. Espceially as he is now proud of getting all the way to 2 miles!