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人体和刚体一样在空间可作三维运动．三维运动的物体有3个相互垂直的运动轴，有6个自由度．沿3个轴可作三个方向的直线运动，也可绕三轴转动或旋转．但在人体下支撑时三个轴直线方向的运动受到约束，可作三轴的转动或旋转，称为人体三维转动．三维转动是人体的运动技能，是人体运动时气血循环体液代谢的基础，也是人体一种运动规律．人体运动通过三维转动调动大群肌肉产生动力，又以转动的形式传递作功．体育运动时由于高速度大负荷约束了人体平时的运动条件，在约束力作用下人体三维转动必须经过训练才能完成，三维转动训练可提高人体运动机能．
Body and rigid body can be used in space for three-dimensional movement. Three-dimensional objects have three moving axes perpendicular to each other, with six degrees of freedom. Three axes along the three axes can be used for linear motion, but also around the three-axis rotation or rotation. However, under the support of the human body when the movement of the three axes in a straight line direction is constrained, for three-axis rotation or rotation, known as the human body three-dimensional rotation. Three-dimensional rotation is the body’s motor skills, is the body’s circulation of blood and blood when the basis of fluid metabolism, but also a kind of human movement law. Human movement through the three-dimensional rotation to mobilize a large group of muscles to produce power, but also in the form of rotation to transmit work. Due to the high speed and high load in sports, the human body’s usual exercise conditions are restrained. The three-dimensional rotation of human body must be trained to be completed under the restraining force. The three-dimensional rotation training can improve the human motor function.