empezar a sudar por el esfuerzo

(v.) = work up + a sweat, work up + a lather

Ex. You can work up a sweat in a swimming pool just as quickly as you can in a gym.

Ex. There's one option that lets you work out without working up a lather.

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(v.) = work up + a sweat, work up + a lather

Ex: You can work up a sweat in a swimming pool just as quickly as you can in a gym.

Ex: There's one option that lets you work out without working up a lather.