Join Date: Jul 2009
Location: The great, white expanse of Maine...ugh!
This is an oversimplification, but the big difference between extending/collecting and merely speeding up is tempo. The tempo doesn't change between stride lengths, but the amount of ground covered with each stride does. Picture a horse doing an average-Joe trot around a ring. Imagine he's on cement and he's shod, so you hear the clip-clop clip-clop in your mind. Now, have him collect, without that clip-clop changing at all. To accomodate the extra time per stride, the horse's legs raise higher as the stride shortens. Now, back to the medium trot, keeping the rhythm, and into extension. The rhythm doesn't change, but the horse sits back on his haunches and utilizes the full length of his legs per stride, opening up the length a lot.
And now, the men of the Second Armored Division with their famous close-order swanning about.