Walking – If you’re able to walk around outside and take advantage of the nice weather, do it! If not, spend some time walking around your house. If you have a flight of stairs, go up and down them a few times (add some extra weight like a backpack with a few books inside!).
Jumping Jacks – Great cardio exercises, and good for warming up, too.
Pushups – Do them on your knees, instead of keeping your legs straight. Or, do them standing up against a wall.
Leg Lifts – If you find it hard to do the exercises with your legs straight, try bending them slightly. Learn how to do leg lifts here.
Crunches – When you’re just getting started, don’t worry about getting your head all the way up. So long as you’re going up until you feel the stretching of the muscles, you will see some benefit.
Jogging In Place – Jogging is a great exercise for your heart. You can jog in place at home while watching TV or listening to music. The only equipment you will require is a good pair of shoes, to eliminate any stress to your legs.
Squats – As long as you’re able to do a few repetitions, you will be providing some benefit to your body. Make it a more intense workout by hugging something closer to your body (like a textbook) to add some extra weight.
Light Weight Lifting – Use whatever you can find in your house. Start out with something lighter, such as a can of peas, and work yourself up to heavier items. You can use milk jugs, laundry detergent bottles or even water jugs.
Dancing – Dancing is a wonderful exercise, which is great for your heart. Not only that, but it can lift your spirits as well, and give your overall feeling a boost.
Dips - These can be done with a chair, couch, or anything that supports body weight. Learn how to do dips here.
For a little more of an advanced workout, feel free to visit this site! Great visuals and instructions!