Tight hip flexors can significantly restrict muscles for hip extension, such as walking or running. When this happens glute max then becomes inhibited by a tight hip flexor. The glutes are very important for movement and alignment. Glutes provide stability for the hips and pelvis, which also supports the alignment of the lower back and knees. When hips aren't stable the lumbar spine and knees compensate.
Testing for tightness tomorrow and rolling prior to spin tomorrow😃