i use cytomax which helps delay lactic acid build up. as for technique, lance amrstrong uses a very high cadence in a lower chainring than usual. when u r in a higher gear, lactic acid builds up faster, but if ur in lower gear, u have less lactic acid buildup but ur cardiovascular system gets a much harder workout. this is one technique armstrong uses that his competetors dont really use. he has been working on this technique for years to build up the cardiovascular strength