In muay thai boxing there is the low kick to the inner thigh of the opponent's leading leg as shown in : link to video I have practised this in training and seen people with bruises from those kicks. ...
I'm into Ninjutsu. We have just started some boxing + kicking: Gloves, mouth guards. I'm speaking "friendly" here - this is in-house sparring, not MMA competition. So, the instructor has recommended ...