Run Less to Grow Faster

Image by SSCusp via Flickr

Running doesn't build muscle mass. If it did, marathoners would have legs like defensive linemen, and workers in Boston would have to repave the streets each year following the city's signature race. But running shrinks muscle fibers to make them more metabolically efficient, thereby saving the pavement.

You'd think you could get around this by lifting weights in addition to running, but your body negates that work through a mysterious 'interference effect.' Your type II fibers—the biggest ones—will still grow if you run and lift. But your type I fibers won't, and even though they're smaller than the type IIs, they probably comprise 50 percent of the muscle fibers in your body that have any growth potential.

Cut back on your running program and you'll see growth in both your slow- and fast-twitch muscle fibers, and perhaps finally get your body to look the way you think it should.

[via MH]