When your opponent stretches their arms to push your torso in a desperate attempt to escape the mount, you must have the armbar locked in place. Finishing via armbar is an automatic response to your opponent's vulnerability. But in order to acquire this ability to react quickly and effectively, it's necessary to repeat this mechanic over and over. Note that in order to optimize this process, Renzo Gracie splits the armbar attack into three parts, so that you can more easily notice the details of adjustment and weight distribution. Try it out and be blown away by the results brought about by this drill.