The cramped muscles of his legs refused to hold him up.

Every muscle in her body refused to respond to the urge to flee.

He tried to sit up, but his muscles refused to obey.

He wanted to turn and run, but muscles refused to obey.

Now Herald was staggering, as the muscles refused to respond fully.

And his muscles refused to develop the right kind of strength for a longsword.

He wanted to drop out of sight; but his muscles refused to act.

He tried to move and his muscles refused to obey.

His muscles refused to respond, a finger twitched, nothing more.

Her muscles refused to work, her anger would not rise.