Start; Reaction time Acceleration ability Mid-race running: the ability to maintain high-speed running and the quality of actions performed by various parts of the body. In a running cycle, it includes: landing, cushioning, back-kicking and front-swinging, airborne phases, etc. Back-kick and airborne Landing cushioning phase When the sole of the swinging leg touches the ground, it begins the landing cushioning phase. The landing action should be very active, with the landing position about one and a half feet in front of the projection point of the body's center of gravity. After the forefoot lands, due to the force of gravity and the pressure of the swinging leg's swing, the supporting leg quickly bends for cushioning. The cushioning of the supporting leg is not passive but should actively accelerate the forward movement of the body's center of gravity, with a downward and backward scraping action on the ground. When the body's center of gravity moves to the vertical ground, the joint angle of the supporting leg is approximately 130~140 degrees, the ankle dorsiflexion is about 85 degrees, the heel lifts off the ground, forming a "compressed and ready" posture. During the process of the supporting leg's landing cushioning, the swinging leg rapidly swings forward in a folded thigh and calf posture, until it passes slightly in front of the knee joint of the supporting leg, at which point it is most tightly folded, with the heel almost touching the buttocks. How much does the Jian'erma foot massager cost? When the body's center of gravity moves past the vertical surface of the support point, it enters the phase of the kicking leg's back-kick and the swinging leg's front-swing. At this time, the thigh and calf of the swinging leg should be in a folded posture, tightly folded, which helps shorten the radius of the swinging leg and increase the speed of the swing. When its knee joint passes beyond the supporting leg, it quickly and powerfully lifts forward and upward, driving the same-side pelvis forward, with the thigh forming an angle of about 15~20 degrees with the horizontal plane. With the active cooperation of the swinging leg, the supporting leg quickly and powerfully extends the hip joint, sequentially extending the knee and ankle joints to kick off the ground. At the moment when the back-kick ends, the angle between the two thighs is approximately 100~110 degrees, and the angle between the supporting leg and the ground is about 47~51 degrees. Airborne phase After the supporting leg finishes the back-kick, it enters the airborne phase. At this time, the just-finished back-kick calf follows the inertia of the back-kick and the swing of the thigh, quickly folding towards the thigh, forming a simultaneous fold and front-swing action. Meanwhile, the swinging leg actively presses down with the hip joint as the axis, relaxing the knee joint, and the calf naturally extends forward and downward under the inertial pressure of the swinging leg's thigh, preparing to land. Throughout the mid-race running process, the athlete's head should be upright, the upper body slightly leaning forward, and the arms making fast and powerful front-and-back swings. When swinging forward, it should slightly go inward but not cross the body's vertical midline, with the hand height not exceeding the chin, accompanied by the same-side shoulder moving forward and the opposite-side pulling back actions. When the arm swings backward, the elbow joint should be slightly outward, with the angle between the upper and lower arms being 60~70 degrees during the forward swing, 90 degrees during the backward swing, and 130~150 degrees when in the middle and passing through the body's vertical part. In summary, the mid-race run requires relaxation, coordinated kicking and swinging, tight folding, high lifting, quickness, active landing with a scraping action, strong arm swings, concentration, high spirits, naturalness, and practical effectiveness. 2003-2011 All rights reserved: Chaibang Network ICP Filing License: Health Food Operation License: (Beijing Drug) Health Food Certificate Word (2011) No. 110105-JX0004 National Free Order Hotline: 400-678-0678 Beijing Headquarters Phone: 010-65405556 65405559 Shanghai Branch Phone: 021-20242176 20242177 Complaints Phone: 010-85818899 ext. 803 Advertising Cooperation: 010-85818899 ext. 815 Manufacturer Cooperation 010-59446369 Chaibang Network (China's largest mall), providing the most effective weight loss products, etc., guaranteed genuine products. Nationwide cash on delivery! Information provided by Chaibang Network, all collected online, for reference only.