Which description correctly defines myogymnastics?

• A. Gymnastic Exercises for Hypertonic Muscle Groups
• B. Gymnastic Exercises for Hypotonic Muscle Groups
• C. A Method of Deconditioning Vicious Habits
• D. A Principle Underlying Functional Orthodontics

Answer: (B)

Myogymnastics are therapeutic exercises aimed at improving function by reeducating and strengthening muscles that are underactive. In orthodontics, this means targeting hypotonic facial and oral muscles—like the lips, buccinator, and tongue—to raise tone, improve lip seal, swallowing, and tongue posture. Because the goal is to increase tone in weak muscles, the description that fits best is gymnastic exercises for hypotonic muscle groups. Exercises for hypertonic muscles would focus on relaxation rather than strengthening, deconditioning habits isn’t the standard definition, and a principle underlying functional orthodontics is broader than the specific concept of myogymnastics.