A combination of factors may be involved. Possible causes of persistent stuttering include: 1  Abnormalities in speech motor control. Some evidence indicates that abnormalities in speech motor control, such as timing, sensory and motor coordination, are implicated.  Genetics. Stuttering tends to run in families.
Do Plank Exercises Work? The plank is an exercise that works the bodyâs core, specifically the abdominal muscles and lower back. The exercise is traditionally performed as part of yoga and Pilates regimens but is effective for anyone looking to improve core strength and balance.
movement. Muscles that work together are called agonists or synergists. Muscles that work in opposition to another are called antagonists. In arthropods, locomotion is accomplished by muscles that work against the exoskeleton they are attached to.ovement. Muscles that work together are called agonists or synergists. Muscles that work in opposition to another are called antagonists. In arthropods, locomotion is accomplished by muscles that work against the exoskeleton they are attached to.