IMO di nakakasira ng tuhod yung ankle weights. its the location your playing in. kung madalas kang mag laro sa labas sa cemento ayun mas mabigat sa tuhod at likod mo yan. Pag indoor at may cushion yung flooring bawas wear and tear pero since madalas kang maglaro magkaka wear and tear talaga joints mo >> ankles, knees, back, etc. lalo na pag tournys.

back to the topic, weight training, strenghten your midsection and back, then do some plyometrics just like dehadista said. search mo lang sa google.