Aerobics① classes are designed to tone muscle throughout the entire body and burn calories at the same time. They’re particularly effective for weight loss， because the focus is on continuously moving and maintaining an elevated heart rate. In addition， you’ll notice increased stamina in other aerobics activities， such as walking， running， in-line skating and skiing.
Aerobics doesn’t require any previous knowledge， because the instructor (either in a class or in a home video) will guide you through all parts of the workout， including the warm-up， stretching and cool-down. Because aerobics classes range from beginner to advanced levels， there’s an option② for people of every fitness level， and thanks to the large variety of classes， it’s unlikely you’ll get bored. Many people find motivation from being in a room with others， crediting the team spirit and loud music as incentive③ to finish the class. The psychological boost is another plus. A study found that aerobic exercise helps improve mood and creativity④. If you prefer to work out at home， there are thousands of fitness videos from which to choose. Many are also available for rent at your local video store， so you can try before you buy.
① aerobicsn. 有氧运动，增氧健身法
② optionn. 选择；选择权；可选择的东西；选修科目
③ incentiven. 刺激；鼓励；动机[(+to)][+to-v] adj. 刺激的；鼓励的，奖励的
④ creativityn. 创造力
有氧运动
有氧运动训练班的目的在于使全身肌肉变结实，同时燃耗卡路里。它对减轻体重特别有效，因为它着重在于持续运动和保持心率提高。此外，你会注意到其他有氧运动也可以增强毅力，例如行走、跑步、滑冰、滑雪等。
有氧运动不需要预先准备任何知识，因为教练（在训练班或家庭录像上）会在运动的所有步骤中进行指导，包括热身运动，拉伸运动和放松运动。有氧运动训练班包括各个级别，从初级班到高级班，各种健康状况的人都可以作出合适的选择。而且因为训练班的多样性，你不大可能感到厌倦。许多人从在一个大房间里与他人一起运动找到动力，有人从相信集体精神和倾听大音量的音乐中受到鼓励。它的另一益处是对精神和心理有益。一项研究发现有氧运动还有助于改善心情和创造力。如果你喜欢在家做运动，有成百上千的健身录像带供你选择。在你家附近的录像带商店有很多录像带出租，你可以在购买之前先租来试一试。
