You can get faster in the heal down position, but you'll never have the endurance. The calf muscle, and the tibialis muscle (just to the outside of the shin) that you use in the heal down position are much smaller muscles than the thigh muscles that you use in the heal up position.
Personally, I can see that there are times to use each technique. The trick is to figure out when to use which technique. Of course, other than the anatomy stuff, this is just my humble opinion, and I wouldn't take any offense if someone told me I was all wrong!
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