Can you: Jump up and down 10 times, without causing your heart to race?
你能否：上下跳躍10次，而心跳不會加速？
This is a sign of a well-controlled heart rate (and good cardiovascular fitness). A gym class or workout routine that emphasizes interval training is a great way to boost your endurance and lower your resting heart rate. A lower resting pulse means your heart has to beat less—and should in turn last longer.
這說明心率得到了很好的控制（而且心血管健康良好）。間歇訓練的健身訓練課或者系統的鍛煉是提高你的耐力，降低靜息心率的好辦法。較低的靜息脈搏說明你的心臟跳動得更少，這樣心臟就可以維持更久。

來源:可可英語 http://www.ccdyzl.cn/read/201307/249768.shtml