• 4 年前
HOW DO #MUSCLES WORK?

Muscles are composed of muscle fibres which are themselves composed of myofibrils, which are the contractile units of your muscles. During a workout, these fibres activate: the muscle shortens, creating a muscle contraction, causing the ends to draw closer together, and thus causing movement. When you weight train, you strain your muscles with extra loads or body weight in order to increase your strength , endurance, or muscle mass.

Category

📚
教育

お勧め