Working on the inside requires great cardiovascular training, be prepared to train hard. These shots are effective against people who do not know how to defend themselves on the inside. If you are up against someone who is very smart at shots it is essential to know how to defend yourself from the inside. This is very basic and easy. Stand in basic boxing position: hands up, tucked in, not panicking, using the strength of your arms. It is pretty easy, you are in good shape if you can counter punch, turn away with your hands up to your face. Block with forearm and turn on the inside. As long as you can deflect a punch from the opponent you are in good shape. Make sure not to expose yourself.