What is the difference between muscle fiber types?

Have you ever wondered why some people are fast and others are slower? What makes some athletes better at sprints or power sports, while others are naturally good at endurance events? In general terms, there are two types of muscle fibers: slow twitch (Type I) and fast twitch (Type II). In this video, certified personal trainer and sports performance coach Aaron Patterson explains the difference between the two muscle fiber types and how to train each.

For more information, check out:

• Science and Practice of Strength Training, Third Edition
• Essentials of Strength Training and Conditioning