Millions of us reach for a coffee at least once a day to boost our alertness and counterflagging energy levels。
我们中有很多人每天都至少需要一杯咖啡来提神醒脑，来增加我们消耗的能量。
But what if there was a free alternative that worked even better?
但要是有免费甚至效果更好的法子呢？
Writer Gregory Ferenstein believes he has the answer - 30 seconds of high-intensity exercisesuch as push-ups whenever he feels drowsy。
作家格雷戈里·弗兰斯坦觉得他就有这样的方法——当感到昏昏欲睡的时候，他通常会选择做30秒的高强度锻炼，比如做俯卧撑等。
He discovered that the exercises gave him double the energy boost of his daily Starbucks - andsaved him a considerable amount of cash in the process。
他发现锻炼的提神效果是每日一杯星巴克咖啡的双倍，而且锻炼还能给他省掉一大笔咖啡钱。
He explained: ’Whenever I need a pick-me-up, I find a quiet corner and perform some form ofbody-weight exercise that jolts my heart up to at last 70 percent of the maximal beats perminute (for me, that’s about 170)。
他说：“当我需要提神了，我会去找一个安静的角落来做一些负重锻炼，来使我的心跳达到最快速度的70%(对我来说大约是每分钟170次)。”
He added: ’I’ve found that 30 seconds of high-intensity body-weight exercise gives me thesame mental boost as a shot of caffeine.’
他补充说：“我发现，30秒高强度的负重锻炼和咖啡因一样，可以给人同样的精神刺激。 ”
For reference, a Starbucks Grande Cafe Americano has 225mg of caffeine. He found that hisoverall cognitive performance increased by six per cent after caffeine - but 12 per cent afterexercise。
参考数据显示，星巴克一杯大杯美式咖啡中含有咖啡因225毫克。弗兰斯坦发现，咖啡因使他的整体认知能力上升了6%；而进行锻炼后，他的整体认知能力上升了12%。
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