So you want to start exercising but there are so many programs/systems out there it can be hard to manage. Most people just get a program from the internet or a DVD. It is wiser to figure out your goals and have an assessment. First decide if you want to increase your endurance, gain muscle, lose weight, or just feel better. All of these things will happen with exercise but it takes certain programs to get the results you want. It is very difficult to lose weight and gain muscle. You can improve your strength but your fast loss efforts will keep you from gaining muscle mass. It is possible to improve endurance and strength at the same time but you will not get the maximum results for either.
Next it is best to have an assessment so you know what you need to work on and lower your risk of injury. A personal trainer can help with this or there are some good self assessments such as the one in Gray Cook’s book Body in Balance. This screen will expose your limitations and how to fix them.
Once you have this information and have your goals then you can choose a program that meets these. Make sure it is fun while being challenging but not beyond your ability. Ensure that it is something you can afford and is easy to turn into a habit. Make sure you use your goals and assessment and do not just jump into something that looks cool.