Shoes
I've put on a few pounds having 4 babies (ugh - let's just not discuss weight) and my legs feel better if I wear good sneakers all day on "work" days. "Lazy days" (haha did I mention 4 kids???), I can wear sandals.
But I've stepped on more than a FEW Legos in my time, bad enough that I've bruised my foot and found it quite difficult to walk for a week. So... shoes became necessary. I don't like stepping on toys. I can walk comfortably, my legs don't tire out so much, and I feel ready to attack the day and whatever it brings.