This is due to the feet being strapped into the board and both feet pointing in the same direction, which localizes knee movement and prevents twisting.
这是因为脚被钻进了董事会和双脚指向同一方向，膝盖运动的本地化，防止扭曲。
2
Young female long jump two levels of athletes instantaneous and take off in the process in the board to swing the leg knee Angle oversized folds not tightly.
少年女子跳远二级运动员在着板瞬间和起跳过程中摆动腿膝角过大，折叠不紧。
3
The take-off leg knee joint, hip joint Angle when they get to the board and the most keen Angle in the take-off process are all smaller than those of high level female long jumpers.