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Can you: Jump up and down 10 times, without causing your heart to race?
你能否：上下跳跃10次，而心跳不会加速？
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.
这说明心率得到了很好的控制（而且心血管健康良好）。间歇训练的健身训练课或者系统的锻炼是提高你的耐力，降低静息心率的好办法。较低的静息脉搏说明你的心脏跳动得更少，这样心脏就可以维持更久。
