Hip tightness is usually associated with muscles that cross the hips - 22 of them including hamstrings, glutes, and inner thigh muscles rather than the hip joint where the thigh bone (femur) meets your hip bone (pelvis). Compensation for this “hip tightness” can result in issues throughout the body. In particular, this compensation may be a contributor to lower back pain and knee pain.
Many yoga poses and Pilates exercises improve flexibility and hip mobility. So come to class and work on opening your hips - front, side and back.