Rock Almanac: November 21, 2008

On This Date in 1981: 'Physical,' by Olivia Newton-John, works its way up to the No. 1 spot on the Billboard Hot 100 Singles chart.

The Almanac Advises for November 21: "Exercising to music is said not only to improve your workout enjoyment, it actually enhances your routine by helping you to exercise harder without you being aware."

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