Parkinson's disease affects your ability to move, but exercise can help to keep muscles strong and improve flexibility and mobility. Exercise will not stop Parkinson's disease from progressing; but, it will improve your balance and it can prevent joint stiffening.
You should check with your doctor before beginning any exercise program. Your doctor may make recommendations about:
The types of exercise best suited to you and those which you should avoid.
The intensity of the workout (how hard you should be working).
The duration of your workout and any physical limitations.