许多跑步机都是平的，这让他们成为一个很好的选择如果你是超重或者是容易受伤的特别是有膝盖问题的，并且想要减小影响。
Many treadmills are padded, making them a good option if you're overweight or are injury-prone (especially with knee issues) and want to decrease the impact.
如果你有任何膝关节问题，在这个体式中当问题膝关节是前面的关节时，你可以转达前腿多些以便于膝盖也多转些。
If you have any knee problem, when that knee is your front knee in this pose, you can turn your front foot outward more so your knee can also turn out.
要是有个健康的膝盖，罗伊也没问题。
Well, with a healthy knee, Brandon Roy could have been, too.
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