Originally Posted by LeeD
Some peeps say riding a bicycle.
Peeps like myself agree.
I coach, teach, and play on a rather busy schedule and I'm 47. If I get out for a nice ride maybe two or even three times a week, my knees have zero issues. I use a road bike, get out for 45 minutes to an hour, and I have those pedals that connect to the cleats on my shoes.
Nobody likes to be preached at, but I like to offer this exercise option for lots of people, especially tennis players. I absolutely need to preserve my "moving parts" since much of my work these days is done on the courts. Without a doubt, the one best thing I've done for myself to help with this has been riding my bike.