I know how hard it is to fit in workouts, believe me! My DH doesn't travel, but he doesn't know how to leave the office at a descent time either. So last week, when I decided I really had to focus on myself for a change, I decided I'd try to wake up 1/2 hour earlier (I know, I definitely DIDN'T want to do that!) and see how it goes. DH got me an eliptical machine for my birthday, so that's what I did. I woke up last Monday morning & went on the eliptical (which is really hard when you first start) for about 7 minutes, then laid on the floor & did crunches, then I just did lunges with no weighs around my bedroom. The whole thing took me about 20 minutes - and boy did my legs hurt!!!
So last Wednesday I was able to do the eliptical for 10 minutes, then I did my crunches again & then I used 2 little 5 pound weights I bought at Target & did some arm exercises I saw online. Nothing special or complicated!
My plan is to do this Monday, Wed, Friday & Saturday. And I was really shocked by the fact that even though I lost a 1/2 hour of my precious sleep, I actually had a lot more energy throughout the day!
Good luck, sorry to ramble on.