One of the best stretches you can do in the morning is the "90 90 Kneeling Stretch" with Side Bending.
Perform 2 x repetitions on each side with each stretch held for 20 seconds.
Instructions: Get into a 90 90 kneeling positions with back foot flat on the ground. Bring the arms straight overhead with your palm facing inwards.
Do a side bending by bringing the pelvis out and bending through the back. To intensify the stretch, you can bring the heel out to the side a little bit. You are looking for a light stretch in front of your quads (rectus femoris) and deep in your hip/back area (psoas muscle).
Hold the stretch for 20 seconds and perform twice on each side.