The document discusses the "live high, train low" (LHTL) altitude training method. It explains that LHTL involves staying at altitude or in altitude simulated environments to stimulate erythropoietin (EPO) production and boost red blood cell counts, while training at sea level to maintain high training intensity. Research shows athletes using LHTL have greater improvements in VO2max and performance than those training only at altitude or sea level. The document also discusses mechanisms, benefits, side effects, and strategies for implementing LHTL, including supplemental oxygen, altitude tents, and hypobaric chambers.