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JUNEAU - Gov. Sarah Palin is encouraging Alaskans to sign up again this year for a six-week physical activity competition, and win it again.

Starting this Friday, adults and children can sign up for the National President's Challenge, sponsored by the President's Council on Physical Fitness and Sports.

Alaska had 2,868 people participate last year. That was the highest participation rate per capita among all the states. Alaska took top honors.

Recent surveys show that about 65 percent of Alaska adults are overweight or obese.

The National President's Challenge requires 30 minutes of exercise a day.