How to Increase Layback to Throw Harder 

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No, when the elbow is below the shoulder, the greater tuberosity of the humeral head buttresses against the posterior glenoid rim, creating mechanical impingement, and limiting lay back. Essentially what this means is that the elbow, being on plane with the shoulders or slightly above that plane will allow for the greatest and safest degree of external rotation and lay back and this is why you see this over and over again in professional athletes.