每日英语 health/fitness 健康
1. gain weight: 胖了
if you eat and drink more calories than you burn off, you'll gain weight
如果你吃的和喝的卡路里比你消耗的卡路里多，你就会变肥。
calorie 卡路里
burn off 消耗
2. lose weight: 减肥
running is also a good way to lose weight.
跑步是减肥的好方法。
3. go on a diet：节食、开始有节制、健康的饮食
she would take more exercise rather than go on a diet.
她宁愿多做运动也不愿节食。
4. work out/exercise: 健身、运动
work out更口语，更常形容在gym(健身房)里的运动
do you often work out?
你经常锻炼身体吗？