Primarily, my own self. :D
I have some mobility and endurance issues. Thursday, I wound up standing the better part of the day, the longest I've done in Quite Some Time, in the service of a Good Cause. (Not a particularly *noble* cause, mind you, just one I found entertaining.)

Today, some Hauling of Heavy Groceries uphill (and then most of them back down again).

I can feel the difference in the muscle tone of my forearms since before I started using the cane. Very much firmer.