Get yourself some resistance bands and you can workout just about anywhere.
Resistance bands take up virtually no space, and weigh nex to nothing. Perfect to store in a drawer or take in your suitcase to when you travel.
Take your resistance band and step on it with one foot. Or, use both your feet to increase the resistance and make it harder.
(A) Hold the band in each hand at arm's length, about shoulder-width apart, and then bend at your hips and lower your torso until it's at a 45-degree angle. So, you are not totally parallel to the floor. Your knees should be slightly bent. Keep your tummy muscles tight and back flat.
(B) Squeeze your shoulder blades together and pull the band up to your upper abs. Keep your tummy muscles tight, but remeber to breath. Pause, then return back to the starting position.