Add Yahoo as a preferred source to see more of our stories on Google. “As a fitness culture, and in society in general, we’re afraid of spinal flexion,” where the lower back is flexed into a C-shape, ...

View post: I Was Crushing My Evening Workouts but Sabotaging My Sleep. Here's How I Fixed My Internal Clock “As a fitness culture, and in society in general, we’re afraid of spinal flexion,” where the ...