NAFC Group Fitness Certification Exam

During a concentric contraction, a muscle shortens while generating tension. This type of contraction occurs when the muscle fibers contract and pull together, allowing for movement against resistance. For example, during a bicep curl, as you lift the weight towards your shoulder, the bicep muscle shortens, which helps to flex the elbow joint and move the forearm upward.

Understanding concentric contractions is crucial for fitness professionals as it forms the basis for many exercises aimed at building strength and power. This knowledge helps trainers design effective workout programs that engage specific muscle groups for desired outcomes, such as muscle hypertrophy and functional strength improvements.