How much can you earn as a personal trainer? Download the Personal Trainer Salary Guide to discover your earning potential. Type of Muscle Fiber
One of the most influential factors is muscle fiber type. We have two basic types of muscle fibers, often referred to as “slow twitch” and “fast twitch.” Slow twitch muscle fibers are best used for cardiovascular (aerobic) activities. They produce small levels of force for long periods of time and thus are better suited for endurance activities. Fast twitch fibers are best used for anaerobic activities. They produce high levels of force for short periods of time and are best suited for power activities such as weightlifting.