A little tougher approach is to tie yourself up to a stretch cord and swim to the other end.

一个比较有难度的练习方式是在腰上系上橡皮筋不停地游到尽头。

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"Thanks, thanks," said Monte Cristo, judging from the steward's utter prostration that he could not stretch the cord further without danger of breaking it.

“谢谢，谢谢，”基督山说道，他从那位管家失魂落魄的样子上判断出，他不能再把弦拉紧了，再紧便有绷断的危险。

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Study Design. An experimental study to investigate the in vitro gene expression of neurotrophic factors and receptors in cultured rat spinal cord cells subjected to cyclic mechanical stretch forces.

研究设计。探讨在体外培养受到循环的机械牵张力作用的大鼠脊髓细胞神经营养因子和受体基因表达的实验研究。

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In a telephone interview, Jones's swimming coach in Albuquerque, Betsy Hall Patterson, explained another drill in which the UFC champ ties himself to a stretch cord which is then secured to a starting block.

WSJ: Jon Jones: A Formidable UFC Champ in a Forbidden City