I can think of two people in my life who were non-fats that used them. My grandmother because Parkinson's has made it hard for her to walk far (she still tries to walk 2 miles to the grocery store sometimes though) and she's 83 or 84 this year. The other person was my mom for a couple weeks after major surgery and it pissed her off to no end. No running for a long time drove her damn near crazy.