Core to extremity movements start with which type of muscles?

Core to extremity movements begin with large force producing muscles because these muscles are responsible for generating the significant power necessary to initiate a movement from the core and transmit that force through the larger muscle groups to the extremities. In functional movements, having a strong core is essential as it stabilizes the body and allows the larger muscle groups, such as those in the legs, back, and chest, to effectively perform their tasks.

Utilizing these large muscle groups ensures that the movement is efficient and powerful, facilitating better performance in various exercises typical in CrossFit training. Starting a movement with a foundation of strength in these large muscles allows for the effective transfer of energy and enhances overall functionality in workouts.

The other options, while relevant to muscle function, do not correctly describe the initial focus for core to extremity movements. Fast-twitch muscle fibers are important for explosive actions but do not necessarily initiate movement in the same foundational way. Small muscle groups contribute to stability and refinement but lack the power needed to drive motion effectively. Force-reducing muscle fibers do not pertain to the initiation of movement as they are not typically associated with force generation.