Great question — answering as the UphillTech team:
Medicine ball such as 3kg for an adult and 1-2kg for adolescent is an awesome investment to improve your balance, patience and leg-eye coordination technique. Learn to balance on top of the medicine ball to work on your core, vital to fast turns and more advanced shots in soccer. Learn to keep the medicine ball on your leg and then proceed to real ball -- it is extremely motivating to see how fast you develop your technique! If you cannot afford medicine ball, put a rock inside a styrofoam or tape and do your ball with some weight. Also experiment with some physics and put the weights on the exterior of the styrofoam and you realise that you are able to get a ball of similar properties as...
Full answer by hhh: https://sports.stackexchange.com/a/13437 (CC BY-SA 3.0).
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