text: You should confine your statement to team sports. Many sports do not experience concussions.due to the nature of them. Violence in team sports is encouraged by ignoring side-effect. Hockey, football, basketball, rugby, soccer are amongst them. Boxing objective to knock-out opponent and. Westling
  of all sorts have same violent spirit. These contact sports  should be banned from Olympics. Finally downhill skiing and jump skiing generate injuries without violence implication.