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。
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，或者一条杆等，都可以作为选择。 % 你还可以对自己加大挑战。
If you add just one or two pieces of equipment: a dumbbell, a kettlebell, a jumprope, a medicineball, or a chinup bar, for example, you can increase thechallenge even more.
这样的杆件在扭转时比实心截面的杆件柔得多。
Such members are much more flexible in torsion than those with a solid section.
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