听力问题请教！！

standforth

XDF第九套第七题：

M:Hey,Pamela,how are you doing?I heard you had an operation over spring break.

W:Yeah,Bill,thanks for asking.I was pretty much out of commission for a few weeks there,but  finally i'm back on my feet again.

Q:What does the woman mean?

A.she hurt her foot

B.her health problem has come back again

C.she's feeling better now

D.she needs an operation soon

答案很明显是B.但是本人对于对话中个别习语不熟，望各位托友指教：

1.out of commission

2.be back on one't feet

请问上面两个习语是什么意思？

brace

out of shape吧？