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Exercise: Ball Squats - Great start for strengthening the knees, hips and glutes. Primary Muscles: Vastus Lateralis, Vastus Intermedius, Vastus Medialis, Rectus Femoris, Gluteus Maximus Stabilizers: Gastocnemius, Soleus, Anterior and Posterior Tibialis Level: Beginners Video (QuickTime)  Video (QuickTime) |