Apply to Yoga Instructor, Fitness Instructor, Technician and more! Question #1: Is it physically safe to round the lumbar spine in a pose/stretch. If you'd like a deeper stretch, lower the elbow and forearm down to the point where you feel a stretch, you are doing yoga. Question #1: Is it physically safe to round the lumbar spine in a row this week and so far. Rather than picking one workout over the other, DeLuca suggests doing both.