自由负重器械和机器负重器械都是受欢迎的力量训练工具，但它们不是唯一的选择，你可以用并不昂贵的阻力塑料管（译者：我猜是指用硬塑料管之类的代替拉力器啥的），或者甚至用自身体重进行力量训练（译者：俯卧撑嘛）。
Free weights and weight machines are popular strength training tools, but they're not the only options. You can do strength training with inexpensive resistance tubing or even your own body weight.
对于远离身体的来球，你可以从不同的方向回击球，并且你的回球需要有力量，而不只是单纯地跑过去用拍子碰一下球或让球停住。
The ball is angling away from you. While you can take different directions to intercept it, you want to hit the ball back with some power and not simply run over and touch it or just stop it.
但当我用另外一侧胳膊的划臂作为起始的话，在第一次划臂时我会把力量用在身体轴心的旋转上---这样增加了划臂的距离和速度。
When I stroked first with the other arm, I added the power of core-body rotation to that first stroke – increasing the distance and speed of my breakout to the surface.
运动员用暗示的力量来达到他们的目标，给他们自己一个他们认为可能的目标，因此拒绝身体畏缩打颤。
Athletes use the power of suggestion to achieve their goals, giving themselves a goal they believe is possible, thus refusing to allow the body to falter.
当我用左手起始划水时，从我身体右侧的一个基点，我能够将力量全部用在左臂和左肩部。
When stroking first with my left hand, from a position tipped onto my right side, I was able to tap only the power in my left arm and shoulder for that first stroke.
用飞行翼的上下行程，身体向上移动，但随后的冲程可以对抗这种力量。
With the down stroke of a wing during flight, the body moves up, but the subsequent upstroke can counter that force.
用飞行翼的上下行程，身体向上移动，但随后的冲程可以对抗这种力量。
With the down stroke of a wing during flight, the body moves up, but the subsequent upstroke can counter that force.
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