I played a weekly 5 a side football game until I hit 70 3 years ago with age ranges from mid 20s to me, all footballers or ex-footballers so very competitive for the hour's game. Believe me there were quite a few "collisions". Initially I was concerned about the sensor safety. For different reasons, I already had one of those elastic arm bandages. Putting this over the sensor worked for me and I retired without any sensor loss. Hope you find a suitable solution for yourself from all these suggestions