Work out
锻炼
I decided to work out at the gym at least twice a week.
我决定每周至少在健身房锻炼两次。
Work off
（通过消耗体力）摆脱；(使)逐步消除；排除；清理
She tried to work off the ice cream cake she had just now by running.
她试图通过跑步来消耗掉她刚吃的冰淇淋蛋糕。
Warm up
热身; 做准备活动
It’s necessary to warm up before exercising.
锻炼前必须要热身。
Kick off
(足球或橄榄球比赛的) 开球
The soccer game kicked off at 11 p.m. last night.
足球比赛昨晚11点开始。
Try out for
参加…选拔(或挑选)
He and his friend tried out for the baseball team.
他和他的朋友参加了棒球队的选拔。
Pass out
昏迷；晕倒
The football fan passed out due to excitement.
那个足球迷因兴奋而昏过去了。
Give up
放弃
We wanted to know why he gave up halfway through the marathon.
我们想知道为什么他在马拉松比赛中途放弃了。
Knock out
击昏，使不省人事
The boxer knocked his opponent out with a single punch.
这个拳击手一拳就把对手击昏了。
Drop out
弃权，放弃(或退出)比赛
He hurt his left foot and had to drop out the race.
他左脚受伤，不得不退出比赛。
Let down
使失望
He really let his parents down when he dropped out of the National Swimming Team.
当他退出国家游泳队时，他真的让他的父母失望了。
Chicken out
临阵退缩；因胆怯而决定不做
Johnny was going to try sky diving, but he chickened out at the last minute.
约翰尼本来打算尝试跳伞，但他在最后一刻退缩了。