This new study from Pakistan suggests synchronising exercise to match people's natural sleep-wake cycles or internal body clock could offer the greatest health benefits.
这项来自巴基斯坦的新研究表明，同步运动以匹配人们的自然睡眠-觉醒周期或内部生物钟可能提供最大的健康益处。
Volunteers who tried it had better sleep, lower blood pressure and healthier blood sugar levels overall.
尝试这项研究的志愿者整体上睡眠更好，血压更低，血糖水平更健康。
In the study, a group of 40 to 60-year-olds with at least one heart risk were categorised: 70 as morning larks and 64 as night owls.
在这项研究中，一组至少有1种心脏病风险的40至60岁人群被分类：70人为早鸟型，64人为夜猫子型。
Over three months, some did almost daily exercises at times that matched their body clock, while others did the opposite.
在三个月的时间里，有些人在符合他们生物钟的时间几乎每天锻炼，而其他人则相反。
The findings suggested that forcing a 5am workout on a night owl didn't give great results.
研究结果表明，强迫夜猫子在凌晨5点锻炼不会产生很好的效果。
为什么？研究人员说，因为生物钟影响全天的激素和能量水平，而这反过来又可能影响运动表现和坚持度。
The researchers say because the body clock affects hormone and energy levels across the day, which in turn, could influence exercise performance and adherence.
