This year, I learned that  I’d fallen for a common misconception ― what I thought were stiff hips that needed stretching turned out to be weak hips that needed working out. That should mean exercising is a great way to strengthen your hips, right? Well, mostly ― but speaking to SELF, physical therapist Kellen Scantlebury, founder of Fit Club NY, said that a common cycling mistake can mess up your joints. The way you set your saddle up can seriously misalign your hips,