[SerpentDove]

I don't think I would do Tae-Bo, if that's what you had in mind...

[fuquadukie]

Your stretching should be OK..... unless you place a rug on the floor, face East, get on your knees and stretch your back muscles up and down. In that case, you're on your own.

[SuperLuminal]

As long as you keep your clothes on you should be ok.

[Lazamataz]

Whenever I fly, I do wind sprints towards the cabin area. I run right at the cabin. There's this power-energy bar I eat, called the Oak Bar. It's yummy. So I will usually scream "I Love Oak Bar" but with my New York accent it sounds like "AhLa AkBah!"

So there I am, sprinting to the cabin yelling "AhLa AkBah" carrying a Bic disposable razor I intend to shave with after my wind sprints.

So far, no problems.

[mjf]

Don't do it. Don't do it until it is the bottom of the 7th.

[Tymesup]

I've been stretching back by the lavatories for a few years now. Besides an inquisitive glance or two, nobody's busted my chops.

[null and void]

You must stretch.

If you don't the terrorists will have won...

[testforecho]

Well, I can't leave everyone hanging. Very few crowds today. Other people making connnections said there were long lines elsewhere. No problems stretching mid flight - no gang tackling, etc, etc. :)

[Teacher317]

Here's a good in-flight stretch for you: drop to your knees, face Mecca, and bow several times. Help stretch your diaphragm by loudly yelling "OOLOOLOOLOOLOOLOO!" The airlines and the FAA would, of course, protect your right to do so (and then profile some more grandmothers)... you'll just have to do the second stage of the exercise after the plane lands: sprinting past your fellow passengers through baggage claim and out to your car. =^)