>  Brett's comments about endurance:

<< "Endurance for athletics and recreational activities is primarily a
>   result of three factors: skill, muscular strength, and genetics."
>   Heart function does not come into any of these factors. >>
>
>  You are stating that endurance has nothing to do with heart function? I
>  think you are missing the forest for the trees. Saying that skill and
> genetics are  factors in endurance is reasonable, as is muscular strength if
> what you mean is adequate power with continuing supply of energy substrate
> and oxygen and removal of end-products (lactic acid included)...this
> circulation is in fact heart function!