While Yoga can be a beneficial part of any health regime, participating with injuries or medical conditions is at your own risk, even if you tell the teacher about your situation. Yoga teachers aren't medical or health professionals and can't give diagnoses or treatment advice about injuries or medical conditions, or guarantee that moves and options in the class will be completely safe for your unique needs. If you are unsure about whether yoga is right for you, consult with a medical or health provider. A summary of factors to consider is listed below for your reference.
In a typical Vinyasa-style class, the nature of exercise is athletic, energetic, moderately aerobic, continuous and repetitive. Yoga poses and transitions include (but are not limited to) deep and/or controlled breathing, balancing, rotating, laying down on the floor (face up and face down), inverting the torso (including forward bending), quick transitions to and from standing, stretching and load-bearing all limbs and the trunk, deep bending at the elbows and knees, pushing with the upper and lower body limbs, bracing and compression of the abdomen, twisting the torso, reaching overhead, side bending, flexion and extension of the spine, knees, elbows, wrists and ankles.