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In two to three months, you can go from slug to star with this 5K training plan.

Emily Gilbert is the first to admit it: She's an on-again, off-again exerciser. Ever since her college lacrosse team days, she's geared up many times to make exercise a habit again, but then fallen off that wagon just as many times.

But now, the 24-year-old publicist from San Diego says she has a plan and is sure she will soon become a regular exerciser. She's training for a 5K that she plans to run in about three months. ''The stability of needing to train will keep me in the process [of working out],'' she says. She's hoping training for the 5K will help her make that transformation to a regular, lifelong exerciser.

"I want to get back into that mentality," Gilbert says.

5K Training Plan

Picking a 5K -- 3.1 miles -- as her route back to fitness is smart of Gilbert, exercise experts agree. And she's not alone in thinking that training for her first 5K may propel her on the road to lifetime fitness.

It's among the most popular of road racing event distances, says Jean Knaack, executive director of the Road Runners Club of America, a national association of running clubs and events. "The boom is in the 5K and the half marathon," she tells WebMD.

''I think the 5K is a great distance for beginning runners," Knaack says. Or even walkers, as many 5K events are now billed as run/walks.

Why? The 5K is doable, Knaack says, even if you've spent many more hours in front of the TV than on a treadmill, if you train appropriately.

Here, experts talk about how you can join Gilbert in going from the couch to the 5K course, paying attention not only to your physical training but also your mental attitude. In three months or less, you could go from couch spud to fitness star. (It's always recommended, especially for adults over 50, that sedentary people check in with their doctor before starting to train.)

Psych Yourself Up -- and Off the Couch

While most people focus on the physical training -- at least feeling comfortable jogging or walking 3 miles or so before the big event -- mentally preparing is just as important, says Fabio Comana, an exercise physiologist for the American Council on Exercise in San Diego.

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Ensure you're exercising hard enough to get a good workout, but not strain your heart.

While you are exercising, you should count between...

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