I am 5'0" and 88 lbs. (13 years old) yeah i'm short. I have a 21" vertical. Is that good?

That's great man,I`m 5`7`` with a 25 inches vert.if you want to increase itr you should buy dunknow,that could increase your vert with 8-14 inches.what to you say about that?Jump higher, increase vertical jump, learn to dunk (http://www.dunknow.com) this is the link

After doing 5 weeks of dunknow my vert went from 25 to 28 inches

Im 5'8 with 30 inches :D

That is very good assuming you are not built with muscle because of your weight.

Now I have a 35 vert leap... from 25 to 35 in a half year:)

Is dunknow uploaded with free?Please giveme that link!My email is [email protected]