Judo is an excellent sport were the aim is to use your opponents force against them and throw them on there back, hold them down or strangle them or armlock them.  Top class Judo guys are incredibly strong, fast and have tremendous grip strength. The reason i like Judo so much is because of these physical factors. it develops such incredible attributes that contribute to other aspects of combat sports. One place that trains judo is BJJ Sutherland shire which offer Judo plus Brazilian Jiu Jitsu and Wrestling and kickboxing. You will find the Judo guys are the fittest guys at the gym and lead the way in the competition grappling.