Find out what you need to know about your body's core, including the muscles it contains, what it does, and how to strengthen it.

A good working knowledge of anatomy for runners can help improve everything from your running form to workout efficiency.

To maintain quad muscles, it’s critical to provide them with sufficient stretching and exercise. What Are the Quad Muscles? The quadricep muscles are joined to form the patella tendon.

What is the definition of muscular endurance? It's your body's ability to keep contracting a muscle or group of muscles, also called exerting force against resistance, repetitively.