Which groups of muscles and ligaments are pulled by the horizontal fork and the vertical fork respectively? Please talk about it separately. Thanks

Transversal cross: flexibility of the inner and posterior thighs and hip joints, from inside to outside - vastus medialis - adductor longus - adductor magnus - semitendinosus - semimembranosus --Biceps femoris, action (stretch the legs to the left and right, and use both hands to assist with support; the small back sides of the legs touch the ground, press the ground tightly, the heels of both feet touch the ground, and the toes stretch to the left and right or hook the hips tightly Fully open, into a - shape, you can lean forward to lengthen the muscles on the back of the legs and fully open the hips; it is also called to lean the upper body to the left and right, fully lengthen the muscles on the inner and back thighs and increase the range of movement of the hips. : straighten the waist and back, open the hips and sink the hips; straighten the knees and hook the feet, lean forward)

Vertical fork: flexibility of the front and rear thighs and hips, from back to front - semitendinosus - Semimembranosus - biceps femoris - rectus femoris - sartorius muscle, action (separate the legs in a straight line from front to back, press the heel of the front leg, calf gastrocnemius and hamstring muscles against the ground, and hook the toes upward Tilt up, facing upward; press the instep, knee and quadriceps of your hind legs against the ground, and point your toes straight back; place your hip joints perpendicular to your legs, and press your buttocks against the ground to keep your upper body straight. , the forward bending vibration movement of pressing the front leg, and the backward pressing vibration movement of upper body bending can also be done to increase the difficulty of the movement and the stretching range. The range of movement is from small to large, and gradually exerts force. Key points of the movement: straighten the waist. Straighten your back, sink your hips and straighten your knees; bend forward and hook your feet, bend and extend your ankles backwards)

(Approximate analysis, for reference only!)