wicked-naughtily or annoyingly playful; teasing and worrying with impish laughter; a wicked prank. impish, implike, mischievous, pixilated, prankish, puckish, arch. playful-full of fun and high spirits; playful children just let loose from school.
Inspiratory Muscles. The principal muscle of inspiration is the diaphragm, a domed sheet of muscle that separates the thoracic and abdominal cavities. The diaphragm attaches to the lower ribs, as well as to the lumbar vertebrae of the spine.
Agonists and Antagonists. Activities such as running involve muscles working in pairs. Muscles are commonly arranged on opposite sides of a joint. When one muscle contracts and shortens, the opposing muscle must relax and lengthen to allow movement.The only exception to this is isometric contractions where no movement occurs.sometric contractions result in muscle tension but no actual joint movement. The muscles in your neck must contract isometrically to keep your head up while you run and the muscles of your core or midsection must contract in the same way to stabilize your spine.