What is a good children/teenage boxing class in Central New Jersey?

I’m 13 years old and think I’m becoming a bit out of shape. I want to get my normal appearance back before the hotter seasons come along and can’t really dedicate myself to just working out, so I want to have a little fun with it. Can anybody tell me where there is some form of a fighting class (preferably boxing) for teenagers in the Central Jersey area? Red Bank and Long Branch in specific. Thanks.

http://www.bgca.org/clubs/