system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Group following sports based on their similarities. Consider the instruments used, place and duration:

Tennis, kick-boxing, football, squash, boxing, rugby, table tennis, taekwondo


assistant
These sports can be categorized into as following groups;
- Footballs sports: Football, rugby 
- Racket sports: tennis, table tennis, squash
- Combat sports: kick-boxing, boxing, taekwondo