It's never too late to get in shape, especially during a pandemic. Social isolation and worry raise stress levels, and exercise can make a dramatic difference in mental as well as physical health. But it's important to remember that not all exercises and exercise plans are created equal. If you're over 50, you may need to manage issues like past injuries, joint pain, and chronic muscle aches. We reached out to a team of experts to weigh in on the best workouts for staying fit — and safe — as we age. Check with your doctor to see which might be best for you.