Isometrics are one of the most underused training methods for creating high amounts of tension and stress in the muscle. Isometric training produces a greater level of activation than any other type of contraction. One of the main benefits is that the body is able to activate nearly all the available motor units, something that's usually very difficult to do.
Isometric holds also increase joint stability, improve reversal strength, and may be helpful in rehabbing injuries. It's also great because it can help you develop a stronger mind-muscle connection.
Think you have what it takes to make it in the world of elite sports? Do you have immense talent and ability? Great, but so do a few thousand other guys. Unfortunately, all of these things will only get you so far in this world where good isn't often good enough. At this level you have to be one of the best just to get your foot in the door.
Whether your goal is to deadlift 400 or 700, two things are clear: you've got to bloody some shins and you've got to learn these cool training techniques.