Exercise is good for you,
but you need to make sure that you are in a condition to handle whatever you plan to do before you start.
Especially if you have not taken regular exercise for some time.
It makes sense to get a thorough physical check-up before you begin with any exercise regime, tell your physician why you are having the check-up and what you plan to do, because they may have some advice or input that will help you rationalize your plans.
Also understand that the majority of people who have not exercised for some time should start off slowly, no matter what form of exercise they plan to follow.
Trying to do too much, too quickly could potentially be even more harmful than doing nothing at all, because the strain that it places on your body may be too much.
The risk of injury or even worse is that much greater if you try to do things too quickly.
Another thing that you should do before beginning any regime of exercise is to acknowledge and accept your age and general physical condition.
While we all like to believe that we can still do things that we could do in our teens and twenties, when you reach the second half of your life the truth is, you simply cannot do what you could at one time.
Accept that and try to avoid seeing it as a challenge that has to be overcome. Doing so is likely to lead you to try to do too much, and again, that can significantly increase the risk of injury.
Getting injured is one of the surest ways of stopping your exercise program dead in its tracks, so the increased risk inherent in doing too much, too soon is really not worth it.