Warming up with gentle stretching can help get your body ready for your workout. Gentle
stretches such as side bends, shoulder shrugs, arm circles, overhead stretches, and bending to reach (but not touch) your toes are all good warm-up exercises. Do three to five repetitions of each. If you are swimming or walking, you can also warm up with a slower swim or walk.
If you have OA in your knees or hips, you want to avoid any jolting exercise like jogging that causes your feet to pound the ground.