What are the symptoms of lactic acid buildup in the muscles?

Cramp, muscle spasms, fatigue are all symptoms of Latic Acid build up, with anaerobic exercise (without oxygen,ie like sprinting) causes this to build up very quickly as Latic acid is also a build up of carbon dioxide in our bodies. With aerobic exercise your contantly giving your body the fuel it needs to keep burning and replenshing your body with oxygen.