Author: immortals

Per Bernal / M+F MagazineMuscle Fibers: What’s the difference? Type I (Slow-Twitch)ROLE: Endurance-focused, slower to fatigue. Has a lot of mitochondria (the energy units of the cell); not much power.FIND IT: Muscles that work hard over long periods of time, such as postural muscles, the calves, and the hip flexors.USE IT: For endurance activities such as...