It's probably fine to learn breath and relaxation from a tape or book, but don't try the yoga exercises without a skilled teacher. He or she can make corrections, caution you when necessary, and help you to adapt poses.
Yoga instructors aren't required to be certified, but many are, through many different programs. Ask prospective teachers if they are certified. A certified teacher isn't necessarily better than someone who isn't certified, but it's something to consider.
Although most people can exercise safely, exercise involves some risks. To shift the benefit-to-risk ratio in your favor, take these precautions:
Have a medical exam before you begin your exercise program, including an exercise test with EKG monitoring, especially if you have cardiovascular disease, you are over 35, you have high blood pressure or elevated cholesterol levels, you smoke, or you have a family history of heart disease.
If you have diabetes-related complications, check with your healthcare team about special precautions. Consider exercising in a medically supervised program, at least initially, if you have peripheral vascular disease, retinopathy, autonomic neuropathy, or kidney problems.
Learn how to prevent and treat low blood glucose levels (hypoglycemia). If you take oral agents or insulin, monitor your blood glucose levels before, during, and after exercise.
Always warm up and cool down. Don't exercise outdoors when the weather is too hot and humid, or too cold.
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