Why exercise, why put yourself through it? The short answer is better health. It is a fact that exercise improves your health. Aerobic activity improves heart and lung health. Strength training improves muscle and bone mass. Without regular exercise these systems weaken with age. This begins earlier than most people understand, as it starts in our 30s.
Yes, you read correctly, in your 30s. This may be of some concern to you but don't let it prevent you from taking action.
Regardless of your age, you can begin an exercise program. No one is "too out of shape" to begin a program. Exercise does not mean you have to go into a gym and throw weights around. Nor does it mean you have to run marathons. The opposite is true. Broken down to its simplest form, exercise is movement of your body. Aerobic activity is movement which raises your heart rate. Strength training is just movement against a resistance. So start off simple and work yourself to your desired level of activity.
There are plenty of exercises you can do in the comfort of your own home to improve your quality of life. No fancy equipment is required to start. You could even begin with walking in place with high knees or just walking around your neighborhood. Bottom line, the choice is yours and I hope you choose to day as the day that you start on a path to a healthier you.