Doing this exercise helped rid him of lower back pain and strengthened his posterior chain. Jefferson curls strengthen the posterior chain and may reduce chronic back pain. Physical therapist Daniel ...

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The Jefferson Curl involves standing with feet shoulder-width apart, holding a weight in both hands. Slowly roll your spine forward, letting the weight guide you downward while keeping your knees ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. It’s easy to almost ...