Split your exercise up. This works well if you have a hard time finding the time to work out. If you don't have time to work out for a full 30 minutes, split it up into 10 minute increments to make sure you get all your exercise time in for the day.
Do not stick to one type of exercises only. Every time you work out, you should diversify your exercises so that you work on all your muscles. A good workout should include cardio exercises, stretching exercises and exercises designed towards improving your resistance. You might need to take it slowly in one area at first.
As you can see, anyone can benefit from fitness tips. There is always something to learn no matter your level of fitness. There is always a better or different way of doing something, that you can try to see if it works better than what you are currently doing.