Behind every big, efficient, powerful joint movement is a set of muscles designed for power (phasic muscles) and a set of muscles designed for stabilization (postural muscles). The difference between these muscles lies in their muscles fibers. Postural muscles are composed of a higher percentage of red, slow-twitch fibers, which create slow, long-lasting contractions. While our phasic muscles are composed of a higher percentage of white, fast-twitch fibers, which create fast, powerful, short-lived contractions. You can’t have large movement without stabilization and still expect to move with efficiency and ease Methods like Pilates are built on strengthening stabilizing muscles in order to make larger movements more efficient and powerful.