Five nights in Manhattan means five runs in Central Park.

"The reason I'm late calling you is because I was at a TAG class," Jo Dee Messina said during a recent phone interview. "They put you on a treadmill at the YMCA and they run you until your legs fall off."

It is a relatively new habit, something she originally picked up as a means to lose weight. Now the country singer is talking about getting into better shape, maybe taking a shot at the New York City Marathon.

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