斯潘说：“有锻炼总是比没有好。”但是将锻炼分配在两三天里会让你更有耐久力也给你身体恢复的时间。
"Something is always better than nothing," Spang said. But spreading your exercise out over two or three days allows you to build endurance and gives your body recovery time.
缺点：耐久性比乳胶枕和记忆泡沫差；支撑力不够；可能会很贵；可能会长尘螨
Disadvantages: Less dur-able than latex or memory foam; poor support; can be expensive; may harbour dust mites.
优点：比涤纶枕耐久，防尘螨，利于保持体温。
Advantages: Last longer than polyester; resistant to dust mites; help to regulate body temperature.
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