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Overview. 1  A slipped disc in your jaw can cause painful temporomandibular joint (TMJ)-related problems, including a âpoppingâ noise that originates inside the jaw joint. 2  Friction is a massage exercise. 3  The jaw stretching exercise may relieve tension in tight jaw muscles forced out of position.
Why Your Muscles Shake During a Hard Workout. Pushing yourself during a workout is never a bad thing, and going so hard that your muscles start to shake is certainly a sign that you're at your maxâbut your body may also be trying to tell you something.