Tight Quads: Causes, Prevention, and Treatment runnersworld.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from runnersworld.com Daily Mail and Mail on Sunday newspapers.
What to know about the quadratus lumborum a.k.a. the QL, a deep low back muscle that can cause pain during rides. These QL stretches and exercises can help.