Drossin did jump roping, skipping drills, box jumps, and even high-knee sprints through the "rope ladder" that you often see at football training camps.

Drossion跳绳，钻孔，跳箱子，甚至用足球训练营里的“绳梯”来进行高抬腿训练。

youdao

He displaced a bone in his knee while playing football.

他踢足球时膝盖骨脱臼了。

youdao

He started as a professional football player. But an injury to his knee in nineteen fifty-eight ended his short career.

他原是专业足球运动员，但在1958年的一次膝盖受伤结束了他短暂的足球生涯。

youdao

The problem was an old flag-football knee injury that had caused muscle atrophy on the injured side.

FORBES: Two MRIs Cost $14,961

An old flag-football knee injury had hung around too long, which led to muscle atrophy on the injured side.

FORBES: Magazine Article

McGinley, who sank the winning putt in the 2002 Ryder Cup, started having knee problems as a 19-year-old when he broke his left knee-cap playing gaelic football, an injury that turned him towards golf.

BBC: SPORT | Golf | McGinley rules out PGA appearance