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As co-host of “CBS This Morning,” Norah O’Donnell wakes up well before dawn. She credits her fitness regimen for giving her the stamina to make it through workdays that regularly stretch well into the evening.

The workouts also offer a little midday fun, even if the sessions are regularly 75 break-free minutes. The nonstop nature, she says, keeps her heart rate up and doesn’t allow her focus to shift. Plus, she says, “It also doesn’t allow me to think about quitting!”