The main muscle groups involved in neck health: deep neck flexors (deep muscles that balance the head front-to-back, often the weakest group), upper trapezius (the muscle where shoulder-neck tension most often builds up), levator scapulae (connects the shoulder blade to the neck, frequently implicated in one-sided pain), and sternocleidomastoid (runs along the side of the neck, active in turning and tilting the head). Most modern neck pain comes from an imbalance where the deep flexors are weak while superficial muscles (like the upper trapezius) are overworked. Neckly's exercises target this exact imbalance: strengthening the weak muscles while stretching the overly tense ones.