Implants are pretty rugged and pretty durable but they are not stainless steel. At some point, one or both may wear out and need replacing. Still, these implants are put through some pretty rigorous testing prior to being put on the market and should be able to withstand anything that the normal breast encounters. Go play your rugby! More power to you! Worst case scenario, an implant breaks and has to be replaced. The implant companies in this country have warranties for broken implants so you should be covered, at least, for ten years. It's a bit of a nuisance but I would hate to see you give up something you love and live your life around your implants.