My father has been walking much more lately...

‌Since he retired and has more free time, he says he wants to go for walks every morning and evening... lol
He enjoys it himself, but when he comes home, he says his legs feel stiff...
I was thinking of buying him something like sneakers for Chuseok,
but I figured it would be better if he chose the shoes himself, so I just gave him some pocket money instead.
Now I'm thinking of buying him a massager, but has anyone tried Pulio?
It seems like the best option for a Chuseok gift.