If you add just one or two pieces of equipment: a dumbbell, a kettlebell, a jump rope, a medicine ball, or a chinup bar, for example, you can increase the challenge even more.

如果你只用一两个器械的话：一个哑铃，一个壶铃，一条跳绳，一个健身实心球，或者一条杆（用作引体向上）等，都可以作为选择。你还可以对自己加大挑战。

youdao

You know, because you're a dumbbell, 'and went into hysterics.

你知道，因为你自己就是一个哑铃(蠢人)然后她就变得有些歇斯底里起来。

youdao

If you have one in your area, it's worth checking out, especially for their dumbbell selection, which is usually pretty good.

如果在当地有这么一家商店，你值得一逛，尤其是可以挑选下他们的哑铃，相当的不错。

youdao

And just to give you a sense, if you do a cross-cut of this, you cannot show it from this angle, but it should really be sort of a dumbbell shape with the nodal plane in between the two nuclei.

告诉你们这些就是给你们点概念，假如你们把他横切切开，不能从角度上展示，但它还是会保留几分哑铃的形态,以及在两核之间的节面。

麻省理工公开课 - 固态化学导论课程节选

Gravity takes over when you perform most exercises, like a dumbbell curl or a kettle bell swing, giving the body a chance to relax, says Rowdy Yates, a certified personal trainer and fitness manager at Crunch gym in New York City.

WSJ: What's Your Workout: From a Ball and Basket to a Stick and Some Ice