Over the years, I have tested numerous methods to advance my & others skills for conditioning and fighting. A legendary method to build your resistance to failure & defensive tactics is fighting someone who works with his back to a wall. Using a defensive basis, you can move sideways - forward - laterally but, never backwards. This type of battle covers numerous benefits, just to name a few; first, you can't run backwards in retreat, as the wall blocks that escape (you must stand your ground). This builds an iron Will, since, you must defend and counter attack post the attackers abilities to overtake you. Holding your ground allowing oneself to Fight Back, will push oneself to survive through contact and exchanging blows.