The human body has no claws and no long, sharp teeth. Our upright posture exposes our belly, sternum and throat, points where we are extremely vulnerable. Yet we’re not without weapons. The first two knuckles when we make a closed fist. Our elbows, palm heels and knees are areas where our body has a concentrated mass and relatively few nerve endings. This means we can use them to fight back and fight hard. Close quarters combat requires short, sharp moves that are fast and performed in a tight arc with the whole body weight behind them.