A brief YouTube exercise clip (Ben Greenfield) giving step-by-step instructions for performing "windshield wipers" while lying on the back: lie on back with arms to the side and legs at ~90°; lower legs to one side and pull back, then the other side. Provides a modification for those with back pain: bend the knees (aim for ~90°) to reduce strain.
These are the windshield wipers. So you can lay on your back, arms to the side, legs in a 90 degree angle. You're going to go down to one side and then pull. Go to the other, pull.
If this gives you some back pain or it's too hard, you can just bend your knees and do it. Try to bend at 90 degrees.
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