Via Buddhist Boot Camp / FB:

Meditating is the ability to control the mind from drifting away from whatever it is you want it to stay focused on. Gardening can be a meditation, building model airplanes, painting, or, of course, sitting down for a few minutes and focusing on the breath and nothing else. It's difficult at first because we've never trained the mind to listen to us. But once you are in control of your mind, everything else in life is a piece of cake... ooh, did someone say CAKE? see.. there goes that mind again. :)

Even if you sit for twenty minutes and spend twenty minutes trying to bring your mind back to the breath, you have not failed at meditation! Catching the mind as it drifts off and bringing it back IS mediation. Don't be discouraged.. keep going!