running on the treadmill has never been Jennifer’s favorite aerobic activity, but tonight it seems as though there are lead weights on her thighs. Determined to finish her workout, she inwardly groans as she looks at the clock and realizes that she has jogged for only three minutes. As she adjusts the volume in her headphones, a favorite rock song begins. Coincidentally, the driving thump of the bass is the same tempo as her footsteps! Suddenly, Jennifer finds that there are no longer any weights dragging her down. She falls into the rhythm of the song and begins to feel light and energized as she effortlessly jogs and hums along. A connection with the music and the rhythm is a stimulus that provides momentum, and it enables Jennifer to complete her workout more enthusiastically