NAFC Fitness Assessment Practice Exam 2025 – Complete Test Prep

Isotonic muscle contractions involve the muscle changing length as it generates force, which occurs either through concentric (shortening) or eccentric (lengthening) movements. Dynamic training specifically emphasizes these types of movements, as it incorporates exercises where muscles are actively contracting and relaxing while performing a movement through a range of motion. This type of strength training allows for both the development of muscle strength and functional movement patterns.

In contrast, circuit training includes a sequence of exercises that may combine different types of training, including both isotonic and other forms, but is not exclusively focused on isotonic contractions. Static training, on the other hand, involves isometric contractions where the muscle exerts force without changing length, and aerobic training primarily focuses on cardiovascular conditioning rather than strength training. Therefore, dynamic training is the appropriate term that aligns with isotonic muscle contractions.