Try bringing your elbows to the floor. When your arms are active and your elbows are raised off the floor the majority of your weight is sinking into your pelvis. For some students, this is too intense. Bringing your elbows to the floor and lifting gently through your chest distributes some of your weight into your upper body and decreases the intensity of the posture. You will receive the exact same benefits in this variation, and you may be able to hold the pose even longer!
See alsoEveryday Yoga for Athletes: 6 Post-Workout Hip Openers