If a few brief hip flexor stretches is your idea of mobility work, you're cutting yourself short. Make hip mobility a priority, and your reward could be a better squat. Aug 30, Weak hip flexors (including your psoas) limit how deep you can squat and lunge and The majority of men will fail this simple fitness test. Jun 23, At the hip joint, your pelvis and femur -- the largest bone in your body -- join together. Many different muscles cross this important joint, allowing. 3 HIP FLEXOR Exercises to Improve HIP RANGE OF MOTION Stretching, strengthening and exercising your hip flexors are just as important as exercising other muscles in your body. Strengthen and loosen your hips with. woman lifting weights in the gym. Many hip flexor strengthening exercises can be done at the gym, though they can also. When was the last time you went to the gym just to get in a hip flexor workout? Probably never. But while you obviously don't have to get in a full workout each.