you can't learn a thing with out a trainer who understands boxing You can get fit but you don't need a speed ball to do it but like I said its up to you :P I wouldn't get a punch bag because if you hit it wrong (you will ) for 10 months of what ever you'll have to work hard to break you're old habbits and learn correct stuff... with a speed ball you won't get that because you don't actually perform that movement in the ring but for you what develop its not worth the money... invest in a good pair of running shoes