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By Kevin Kolodziejski In “Rebellion (Lies),” the indie band Arcade Fire sings what obsessive Type A’s believe: “Sleeping is giving in.”  That hitting the sack for more than five or six hours a night makes you a weak-willed slacker.

by Gabe Mirkin, M.D. Two exciting studies show that older men and women who have cycled for many years do not have the markers of aging found in non-exercising people (Aging Cell, March 8, 2018). Their muscle size and strength, amount of body fat, levels of hormones such as testosterone, and blood cholesterol levels were…