All the aerobic conditioning in the world is not going to help you with
anaerobic performance. When you are using the glycolytic energy system,
which is the main system that TKD competitors use, a negative metabolic
byproduct is that the energy production creates lactic acid faster than the
body can use it. This is the sensation of "heavy legs" we have all
experienced when we are not in top shape. The term for this is the lactate
threshold. This is the point where the lactic acid starts to accumulate
causing a decrease in performance. In an untrained person, this threshold
might be reached in a few seconds or a minute... but in a trained person
this threshold can be pushed out to around 3 minutes, WITH ANAEROBIC
CONDITIONING. Aerobic conditioning will not help you use an anaerobic
energy system more effectively. Remember, the main factor that determines

which energy system provides the majority of the energy for work is
INTENSITY of activity. At a certain point, the intensity will have to
decrease so that work can continue. Think about starting out and running as
hard as you can, you will last a few seconds (or more if you are better
trained), but eventually you will have to slow your pace if you expect your
muscles to continue to function, eventually the intensity will have to
decrease to the point that the aerobic energy system takes over. However,
in a 2-3 minute round of TKD competition, this should not happen to a
trained athlete.