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Let's look at arguably the most efficient mover on a squash court, Nick Matthew, and see if we can learn anything form his posture on the T. The first thing to notice in his position, is his level of relaxation, there's little tension here at all and he is relaxed and ready to go. There's no bouncing, crouching, fidgeting or big racket movements. He starts his movement into his split step from an almost stationary position. This is a fantastically efficient method, with no extra effort being expended whatsoever.
The second thing I'd like to point out is how tall he is on the T. He doesn't sink, in fact he is pretty tall with just a small degree of bend in the knees. This is enough for a smooth transition into his split step which will really generate the explosion from the T.
Another smooth mover here - Chris Ryder in the blue. You can see the same things happening. First a relaxed position on the T, second he stays nice and tall with a little sink in his knees which leads him to his split step. Minimum effort wasted, Maximum explosion off the T.