Kung fu has punching and kicking plus it offers limbering - it is a martial art but it also teaches self discipline and energy grounding that can help manage anger and other reactive emotions. It is more than just an emotional outlet. It can be a path to recovery or maintenance.
The object in Kung Fu is not to hurt the opponent but to become a master of your body, mind, strength and emotions plus you do have the emotional releases that boxing offers as well with sparring where you wear protective gear to protect you.