Toning shoes—walking shoes with a specially rounded sole—are popular with fitness enthusiasts. ████████ █████ ████ ███ █████ ███ ███████ ██ ██████ ███████ ██ ██████ █████ ███████ ██ ████ ████████ ████ █████ ██ ██████ ███████ ██ ████████ ███████ ██████ █████████████ ████ ██████ ██████████ █ █████████████ ██ █████ █████ ███ ███████ █████ █████████ ██ ██████ ██████
Toning shoes don’t exercise leg muscles more than regular shoes, yet many people who switch to toning shoes soon develop stronger leg muscles.
The correct answer will be a hypothesis that explains a key difference between toning shoes and regular shoes, beyond the actual exercise the shoes afford. This difference likely rests in who wears the shoes. For example, people who switch to toning shoes may also start making a concerted effort to get exercise.
Which one of the following, ██ █████ ████ █████ ██ ███████ ███ ████████ ███████████ ██ ███ ███████████ ██████
Toning shoes strengthen █████ █████████ ███████ ██ ███ ████ ███ ███████
Muscles in the ███ █████ ██ ███ ███████ █████ ██ ██████ █████ ██████ ████████████
Many people find ██████ █████ ██████████ ███████████ ███ ████ ████ ██ █ ███████
There is little ████████ ████ ██████ █████ █████ ████████ ██ █████ ████████
Shoes that strengthen ███ █████ ███ ███████ ███ ████ ██████████ ████ ████████ ██████