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In this video Gallo from http://www.squash-tips.com teaches you the first and most important skill to develop in squash: Opening, which means preparing the shot before moving toward the ball.
THis habit is done by all the pros in squash because due to the fast nature of squash you need to prepare before moving.
Learning preparation will also teach you how to make a proper shot
For in depth analysis of how to open and how to make a shot check the related article @ http://squashtip.blogspot.it/2013/02/squash-tips-2-opening-video.html