Aerobics is hard exercise done to music, usually in a class: lots of stepping, jumping, and moving your arms so that your heart and breathing work hard for a long time. That is the point of the older science word aerobic: the body is working with oxygen, with air.

AerobicsAerobics is hard exercise done to music是跟著音樂做的高強度運動，usually in a class通常在課堂上做：lots of stepping, jumping, and moving your arms有很多踏步、跳躍和擺動手臂的動作，so that以至於 your heart and breathing work hard for a long time讓你的心跳和呼吸長時間都很用力。That is the point of這正是…的重點所在 the older science word aerobic較早的科學用字 aerobic：the body is working with oxygen, with air身體正在利用氧氣、利用空氣運作。

Though actually, people now stretch aerobics to mean almost any sweaty music class, even when the teacher calls it cardio or dance fitness. It was a huge word in the 1980s (bright clothes, home videos), and it still names that old-style class.

Though actually不過其實，people now stretch aerobics現在人們把 aerobics 這個字用得更寬，to mean almost any sweaty music class幾乎任何會流汗的音樂課都算，even when the teacher calls it cardio or dance fitness就算老師稱它為 cardio 或 dance fitness 也一樣。It was a huge word in the 1980s它在1980年代是個超紅的字（bright clothes, home videos亮色系服裝、家庭錄影帶），and而且 it still names that old-style class它現在還是指那種老派的課。

In more careful talk, aerobic exercise is the general idea (a long run counts); an aerobics class is the lesson with the teacher and the beat. You go to aerobics; you do aerobics.

In more careful talk在比較講究的說法裡，aerobic exercise is the general idea「aerobic exercise」是比較廣泛的概念（a long run counts跑久一點也算）；an aerobics class is the lesson with the teacher and the beat「an aerobics class」則是指有老師、有節拍的那堂課。You go to aerobics你是 go to aerobics（去上有氧課）；you do aerobics你是 do aerobics（做有氧運動）。

It is informal-to-neutral, not a doctor's technical term.

It is informal-to-neutral它是偏口語到中性的用字，not a doctor's technical term不是醫生用的專業術語。