Stretching and toning are certainly important, buttheir benefitsare different from that of aerobicexercise.

伸展和拉伸显然很重要，但是，对身体的益处有别于有氧运动。

Surprisingly,aerobic exercise isn't just beneficial toyour heart, it alsosharpens your mind.

意想不到的是有氧运动不仅仅有益身心，还能灵活大脑。

You don't have to be a jock to enjoy the brainbenefits of aerobic exercise.

享受有氧运动对于大脑健康的福利，并不一定要向运动员般剧烈运动。

Moderateaerobic exercise is plenty.

适度有氧运动就获益颇多了。

Several studies involving older adultsdemonstrated that simply walking a mile or so three timesa week,increases blood flow in the brainand strengthens connections between neurons, resultingin improved mental performance ontasks requiring attention.

一些有关老年人的研究证实，只需每周三次散步一英里左右就能促进大脑血液循环;增强神经元间的“互动”，提高注意力，从而提升智力。

One of the studies divided a group of seniors into two different six-month exercisecoursesonecourse consisting of aerobic exercise,the other consisting of stretching and toning.

一项研究将老人们分为两组：一组做有氧运动;另一组做伸展和无氧拉伸半年的时间。

Again, we'renot talking about marathon-training here.

但是，运动量都是适度的而非马拉松式。

The aerobic-training course gradually built itsparticipants up to walking 45 minutes at amoderate pace three times a week.

有氧运动组让老人们养成了每周三次45分钟正常步伐走路。

At the end of the course, the people who completed the aerobic training showedsignificantimprovements in attention-related mental tasks.

有氧运动训练完后，参加者在注意力相关的智能测试有显著提升。

The stretching and toning group showed littleimprovement.

而后一组受训前后并无明显差异。