For many, the aim of coaching is to keep up increased power and velocity with out crossing over this threshold. Most athletes need to stave off blood lactate accumulation, coaching in order that they clear it sooner and produce much less. Lactate threshold is the train stage at which lactic acid builds up in the blood. This accumulation of lactic acid is associated with fatigue, and most of the people assume the burning sensation of exhausting exercise is brought on by lactic acid.