Lactate Threshold
The lactate threshold is the intensity of exercise at which lactate builds up in the bloodstream faster than the body can use it. The Lactate threshold is the best predictor of aerobic performance and it can be used to set training zones via watts, heart rate or speed. Additionally, the identification of the fractional use of VO2 max at threshold provides information for training plan design. Lactate threshold is similar to the anaerobic threshold (AT), maximal lactate steady state (MLSS) and onset of blood lactate accumulation (OBLA). Although the definition of these thresholds is slightly different, the concept is the same in that the threshold is the point above which exercise becomes more anaerobic and can only be maintained for several minutes at best.

VO2 max
VO2 max measures aerobic fitness and maximal oxygen uptake. VO2 max is one factor that can determine an athlete's capacity to perform sustained exercise and is linked to aerobic endurance. VO2 max refers to the maximum amount of oxygen that an individual can utilize during intense or maximal exercise and is considered one of the best indicators of an athlete's cardiovascular fitness and aerobic endurance. Theoretically, the more oxygen you can use during high-level exercise, the more ATP (energy) you can produce. Most elite athletes will have VO2max values well over 60 ml/kg/min, however, this number alone is not a guarantee of elite performance. A high VO2 max may indicate an athlete's potential for excellent aerobic endurance, but many other factors can determine the winner of a particular race. Some of these factors include: Skills Training, Psychological Preparation, Lactate Threshold Training, Rest, Recovery, and Nutrition.