This is a stretch for your hip flexors. You’re going to start with the weight on the right knee and stay nice and tall with your posture, pretend there is a string pulling you up through your whole spine and rotate the back leg about 45 degrees. Then you will engage your core by pulling everything below the belly button in towards your spine making yourself skinny at the waistline, then as you lunge forward with the left leg with he weight on the right knee, you’re going to reach that right arm up all the way up towards the ceiling. As you are reaching up with the right arm you’re going to reach down with the left hand, opening up that whole right side. You’re going to hold this pose and stretch keeping that core engaged for 30 seconds and do three sets. Repeat it on both sides.