Burn off the calories / pounds：
To use up the energy (calories) your body gets from food through physical activity or basic bodily functions, essentially expending energy to prevent it from being stored as fat.
“burn off the calories 燃烧卡路里” 或者 “burn off the pounds 减重” 的意思是通过大量体育锻炼 “消耗热量，减脂”。动词短语 “burn off something” 本身指能量或脂肪 “消耗、燃烧” 的过程。在谈论健身减重的语境中，“burn off the calories” 和 “burn off the pounds” 的使用频率都很高。
例句
A: Doctor, I’m putting on weight even though I’m not eating anything different.
B: Running and swimming are two types of exercise that help burn off the calories quickly. Try them for a few weeks and see.
“大夫，虽然我的饮食上没有任何变化，可还是在长胖。”
“跑步和游泳是两种能帮你快速燃烧脂肪的运动。试几个星期，看看效果如何。”
Wow, Mark! You look great! You’ve really been burning off the pounds at the gym, haven’t you?
哇，马克！你看起来很不错啊！你在健身房运动，甩掉了不少脂肪，是不是？
I really burned off the pounds for my sister’s wedding but I put the weight back on afterwards!
为了参加妹妹的婚礼，我减掉了赘肉，但婚礼之后我就又胖回来了。
