Originally Posted by Scott Kustes
Very little aerobic base needed for the 400, relatively speaking. He needs to build up a serious anaerobic base though and the ability to tolerate crushing levels of lactate and acidity that aren't present in the 100 and 200.
Considering that 400m for men is 60% anaerobic 40% aerobic.. you do need some aerobic base.
Have you read Clyde Hart's stuff on training slower to run faster?
Definitely need higher lactate threshold. High lactate threshold is buffered by more mitochondria which is built from aerobic work.
Basically, it's all painful stuff. Mix of anaerobic/aerobic work that he needs to do...