You’ve seen people jogging on the greenway or plodding away on the treadmill, oblivious to all but the ear buds pumping a driving beat into their ears. And, according to science, pumping an extra boost of juice into their workout. The American Council on Exercise recently reviewed seven studies conducted since 1999 that all agreed that listening to music has a positive impact on your workout. (There’s a caveat, but first the facts.)