<p>In the final and 13th installment of <a href="http://www.backhand-city.com/commandments/">XIII Commandments of a Tennis Coach</a> Brian tells you how to keep your game sharp 20 minutes at a time.</p>

In the final and 13th installment of XIII Commandments of a Tennis Coach Brian tells you how to keep your game sharp 20 minutes at a time.

<p>In the final and 13th installment of <a href="http://www.backhand-city.com/commandments/" rel="noopener noreferrer">XIII Commandments of a Tennis Coach</a> Brian tells you how to keep your game sharp 20 minutes at a time.</p>

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The 20-Minute Tennis Workout

The 20-Minute Tennis Workout