Want buff, fat-free legs that would put the Incredible Hulk to shame? Then lunges are your new best friend. While basic lunges work and are great for sculpting your entire leg, adding weights makes you work your core out more and causes your quads to really strain to get yourself up.
And more muscular intensity means more muscle in less time. To learn how to do walking lunges with weights, check out this fitness video. Find yourself grunting and making odd growling noises in pain? Then you're doing them right.