flex one's muscles
tense one's muscles

"If you move around a little bit and flex your muscles, it can be a very good exercise," she says.

No need to flex your muscles at me, you know the answer."

"No problem here, go flex your muscles someplace else."

I beg you not to flex your muscles.

There's too much competition to flex your muscles."

But no, do not flex your muscles."

You engineered the skis, and you have to flex your muscles and learn to balance with them.

"The message is important, so quit wasting time flexing your muscles and take me to Belar at once."

You may also learn to move your feet up and down to flex your muscles and keep your blood circulating.

"Try flexing your muscles a little.

Flex your muscles.

"If you two are done flexing your muscles," said La Forge, "I'd like to take a look at Engineering.

And talking of inferiority, all your assertiveness and flexing your muscles doesn't hide your insecurity.

When you go on a mission, there is no crowd to applaud you-no one for whom you can flex your muscles or show how tough you are.

In other areas, you will have to flex your muscles a great deal more - particularly with your presidential counterparts who have a vested interest in promoting nuclear energy as the panacea of climate change.

Asked if the Russians were using this occasion to deliberately embarrass the Bush administration, Secretary Powell said, "I don't think it is necessarily a flex your muscles, mano a mano thing with the United States."

You have to dart and wiggle between handholds by pressing the appropriate keys, all while flexing your muscles through an additional button-which you're probably tickling with your pinky, considering the Twister-esque spaghetti of fingers on your keyboard.

In it, he wrote that the Philippines was unworthy of claiming the Spratly Islands from China because "as a nation of servants, you don't flex your muscles at your master, from whom you earn most of your bread and butter."

"On this issue, Democrats in the Senate start with 49 votes, and the opposition has 50, so it is a little hard to flex your muscles too much when you start one vote behind," said Mr. Reid, referring to the general split on war issues in the Senate.