Final answer:
The epimysium, a layer of connective tissue surrounding the skeletal muscle, is the fascial system likely to restrict forward bending. Other components such as perimysium, endomysium, and myofibrils play roles in muscle organization and contraction but do not encase the entire muscle like the epimysium.
Step-by-step explanation:
The restriction in the fascial system that can restrict forward bending is most likely related to the epimysium. The epimysium is a layer of connective tissue that surrounds the entire skeletal muscle. The perimysium organizes muscle fibers into individual bundles, each called a fascicle, within the skeletal muscle, which structurally supports the muscle and allows the nervous system to trigger specific movements. While endomysium covers each muscle fiber, and myofibrils are the structural components inside muscle fibers, it is the epimysium that would impact the overall muscle's ability to stretch and bend.