size isn't the be all end all of muscular power. Most people you see now days with huge muscles have barely done any training and over done it on the suppliments, they're just pumped full of water.

Which boxers have Skinny legs? Skinny compared to who? Arnold Schwartzaneger? :P Most of the lighter weights do from all the drying up they do to make the weight, and at lighter weights the focus isn't on power.

Look at guys like a Prime Mike Tyson, his legs where like tree stumps.

Theres plenty you cna do to work your legs out, squats etc.

I do a variety of squats in teh gym, but in my experience the best sport specific exercise for boxing and explosive leg power is sprinting, especially hill and stair sprints, repeated (shuttle runs) etc.

I normally do them in the course of my normal run.