How to train for the 800m the 800m dash is about 50% aerobic ( meaning requires oxygen) and 50% anaerobic ( meaning muscle isn’t using oxygen) so knowing this means that we have to train endurance and speed. how do we do that you may be asking. I set up my training in 8 weeks blocks. All of my blocks would be set up differently based on what your strengths and weakness are, such as I am a good 5k runner