Here is an exercise which is great for improving your core strength, balance and coordination.
How to: Start off in a high plank position. If you have problems with your wrists, then come into alow plank on your elbows instead.
Now you: Extend your oposite arm and leg, hold for a few seconds and switch sides. This is not to be rushed, as you will fall over. Focus on using those central core muscles to help you lift and lower.
See how many you can do and incorporate this move into your daily workout.