By Amy Reinink
The Active Times

Whether it's a sense of self-doubt that creeps up in the middle of a long run or an impulse to hit the snooze button rather than wake up for a workout on a cold winter morning, it's a rare athlete who never suffers from a lack of motivation.

Not even the pros are immune, says Stephen Walker, a Colorado sports psychologist who has worked with a host of elite athletes, including Olympic track star Kara Goucher.

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Slideshow: Best Marathons To Run In America

The good news: The same sports-psychology tips that help the pros can work for weekend warriors, too. Walker offers a few suggestions below.

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