Reclined Mini Crunches
This exercise is specifically designed for those close quarters, economy flights. Recline your seat back as far as you can and lean all the way back into the seat. Place your arms across your chest to keep them out of the way See if you can put a tiny arch in your back. Now, try tightening your abdominals and push your spine down towards the seat. This is the start of your crunch. Try not to focus on lifting from your neck or from your shoulders. Think about your ribs getting pulled towards your hips. Slowly draw your ribs towards your hips and move just an inch. Pause when you reach that inch. Slowly return back to your seat without flopping down. Try to do 8 to 12 reps.
SPECIAL NOTE: For all the In the Gym: Cable and Dumbbell exercises pick a weight that you can do for 8 to 12 reps fairly comfortably and with perfect technique. After a couple of weeks of performing at this weight and with perfection, on then, move up to a slightly heavier weight that feels challenging once you get to that 8th or 12th rep. Once you feel absolutely confident in performing every rep with absolute perfection, only then, go to a heavier weight that is challenging you through out the set.