You can increase the energy of your swing in two separate ways. If someone pushes you, that increases your kinetic energy. By pumping your legs, you can increase your potential energy. By raising your legs at the top of each swing, you can raise the overall center of mass of your body, effectively raising the height of your swing.
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If someone pushes you, that increases your kinetic energy.
如果有人推你，那就是增加你的动能。
But it will be different if someone pushes down on your shoulders. In this situation you do not push back up - you just absorb the push effortlessly into your posture.
但当有人从上而下推按你的肩膀时情况就不同了，这时你不需要顶抗，就会毫不费力吸收掉作用在身体上的力。
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