To reduce your risk of injury, make sure you have the proper gear and footwear for your activity. If you are going for a jog, wear running shoes that are in good condition and fit properly, and dress appropriately for the conditions outside.
Stretch and warm up before each workout, and stay hydrated and well-nourished in the hours before you exercise. When you get moving, pay attention to your body. Dizziness, pain in your chest, neck or back, nausea, or severe pain in your joints are signs to stop and contact your doctor.