Let's say I have three kids under 12 and work as a secretary and make $25,000. Barely getting by. If I have a husband, it's likely he works long hours or that we deliberately work different schedules to avoid day care. So by say, 6 pm, I am home. I need to feed the family, oversee the kids' homework, clean house, etc. I have a crappy car (if any) and no extra money for gas, nevermind a gym membership.
How, exactly, do I arrange for the hour a day of hard charging these kids will need just to stay fit on a healthy diet -- or the two hours they'll need to burn off a high-fat and sugar diet?
I ain't a magician, yanno.