Dr. Stuart McGill is a retired professor who spent his 30 year career studying the spine and has written numerous articles and books about the best ways to strengthen the core muscles that control the spine. On this flashback episode, Dr. McGill shares insights into potential causes of back pain and discusses the findings of his research including his studies on MMA athletes, strongman competitors and his most famous one on the sex positions that cause the least pain for people living with a 'bad back.'

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