For strengthening, try side leg lifts.

肌肉锻炼方面——可以试试侧抬腿。

youdao

For the left leg, do as above, but stand with your right side facing the wall, and put your left leg behind your right.

对于左腿也是如上所示，只是让你右侧身体对着墙，左腿放在右腿后面。

youdao

She lay one fifty-three down on his side and tied a rubber tourniquet around his front leg.

她把153号小狗放倒侧躺，在它的前脚上绑了条橡胶止血带。

youdao

Borthwick claimed a second easy catch to give Bresnan his first Test wicket when Brendan Nash guided a ball travelling down the leg side to square-leg.

BBC: Anderson inspires England victory

It's unlucky to be caught down the leg side, but he didn't help himself.

BBC: Jonathan Agnew column

That improvement was rewarded with the wicket of Rees, caught down the leg side by Niall O'Brien off Andrew Hall.

BBC: Dalrymple century helps Glamorgan press home advantage