A falling object gains momentum as it falls.

下落的物体下落时动量增加。

Perhaps you prefer to be less energetic?

或许你想运动量小一点？

And the more you do, the better.

运动量越大，好处越多。

The universe itself has its own momentum, its own energy.

宇宙有己的动量、能量。

How much exercise do I really need to do?

我究竟需多大的运动量？

As it did, angular momentum became important.

随着它的坍缩，角动量变得重起。

An important thing to know is the impulsive momentum relationship.

重的是知道脉冲动量的关系。

And it's important to get the right dose of activity.

掌握合适的运动量也很重。

But the original star's angular momentum is preserved.

但原始恒星的角动量被保留了下。

How many of you in the last month have exercised less than you think you should?

你们多少人上个月运动量没有达标？

In terms of building muscle, volume is the ultimate factor dictating growth.

就增肌而言，运动量是肌肉增长的根本因素。

That's called conservation of angular momentum.

这称为「角动量守恒定律」。

It's about physics and momentum rather than a strike.

它是关于物理、动量，而不是击倒对方。

Study subjects were grouped according to the amount of activity they reported.

根据研究对象的活动量将其进行分组。

Or maybe that the level of physical activity just isn't the best idea.

或者也许增加运动量并不是什么好主意。

An easy way to think about this is it's called momentum transfer.

一个简单的理解方法，这是动量传递的结果。

What's neat is that they can maintain angular momentum indefinitely.

最酷的是它可以永久性地保持角动量。

That decreased activity corresponded with roadblocks to speech delivery.

这种活动量减少与说话时的障碍相对应。

You might have to cut down on the amount of exercise or sport you do.

你可能不得不减少你的运动量或体育活动。

You can get the motion down and then it puts less strain on your back.

你可以减少运动量，这样可以减少对背部的压力。