Adequate flexibility of the muscles crossing the hip are important for achieving the aesthetic goals of the skilled dancer and are needed for the successful execution of movements such as arabesque.
Try this stretch to stretch the front of the hip:
Hip Flexor Stretch
Hip flexor flexibility is critical for allowing proper technique when moving the leg to the back.
Weakness and tightness of the hip flexors or psoas muscle can result in mis-alignments of the lumbar spine and pelvis, which then affect the legs and stability of the spine especially when mastering movements of ballet technique.
Keep the front knee directly over the front ankle.
Press your hips forward and down
Avoid bouncing, sustain the pose for 10-15 breathes. Release and repeat.
Press the hands on the thigh of the front leg to keep the torso upright.
Once you are comfortable in this position, reach your arms forward and up.
Lunge with the back foot remaining on the ground.
Hands can press into blocks on either side of the foot to maintain balance.