How heavy is a medicine ball?

http://en.wikipedia.org/wiki/Medicine_ball In the late nineteenth century and early twentieth century, the words "health" and "medicine" were synonymous. The so-called "Four Horseman of Fitness"...

Medicine balls are so heavy because they are filled with sand. Medicine balls are used for training atheletes and people in physical therapy to regain muscle strength.

It is good for catching heavy Pokemon such as lugia, steelix and such

a heavy ball is a pokeball that helps you catch heavy Pokemon like onix groudon usaring steelix and some other Pokemon hoped it helped!

you get aheavy ball in sport shops