Improving your fitness can dramatically improve your lifestyle. Self-image issues, confidence and general energy levels are hugely dependent on your fitness level. Studies show that people who are overweight are far more likely to suffer from depression than people who maintain a healthy body mass index (bmi).
If you are a professional athlete you will need to put a lot of effort into maintaining your level of fitness. As you get more fit it becomes harder and harder to increase your fitness level. If you are very unfit it is relatively easy to increase your fitness level and so improve your lifestyle.
Before embarking on a new fitness program you should always consult a professional personal trainer to get a workout routine and establish fitness goals.