What is 2 shell defense?

What is 2 shell defense? The two-high shell presents the opposing offense with a light box, which can make it inviting to run the ball. The secret, of course, is that these defenses have their run fits structured to still be sound and effective against the run while more resources can be used to defend the pass.

The two-high shell presents the opposing offense with a light box, which can make it inviting to run the ball. The secret, of course, is that these defenses have their run fits structured to still be sound and effective against the run while more resources can be used to defend the pass.
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