The first is a total body exercise that involves multiple joints with dynamic movement that creates many muscles working at the same time. It's a squat, curl to press using dumbbells as your resistance. It is one of those exercises that is easy to do whether you're home or away.
The second exercise is targeting your natural weight belt, your core. It is known as a forward ball roll. It can be done on your knees or standing. It does require a stability ball.
The third exercise is to work your back and is very beneficial to help improve posture. It can be done with a partner or on your own. This one requires a stretch band. Depending on how you challenge yourself, these exercises can be a great workout in a short amount of time.
Remember to do a sufficient warm up before beginning these exercises and cool down after. Depending on your goals, do these exercises one after another with a thirty second to a minute rest after the third exercise. Try doing 15 to 20 repetitions per exercise, and do two to three sets per workout.