Lower-back pain is perhaps the most common problem for golfers. While the reasons you might feel pain down there can range from a bulging disc to a narrowing of the spinal column (stenosis), it's most often a soft-tissue injury (tears, inflammation, etc.).
While acute pain is all the notice you need to go see a doctor, minor aches can be prevented in the future with some exercises that focus on activating and strengthening the core muscles, particularly around the lumbar spine. Watch Ben and Baltusrol Golf Club's new director of fitness, Joe Yoon, demonstrate a great exercise you can do in the gym or even in the living room to help prevent future lower-back issues.