Muscles: Muscles are tissues responsible for producing movement and maintaining posture. They work by contracting and relaxing. Injuries & Illnesses: Muscle strains, muscle atrophy, muscle spasms, myopathy, fibromyalgia. Specialists: Orthopedic surgeons, physiatrists, physical therapists, neurologists. Procedures & Therapies: Physical therapy, massage therapy, electrical muscle stimulation, exercise therapy, myofascial release.