H2O + Cobra
You can stretch farther forward without the floor in front of you.
Stand with your feet about 2 feet from the pool wall and place your hands and forearms flat against it. Look up and sway your back, stretching your abs. Rise onto your toes and hold for a few breaths.
H2O + Stork
The water makes it easier to hold and balance, so you get a deeper stretch.
Stand and lift your right leg with your knee bent until your thigh is parallel to the pool bottom, keeping your toes pointed. Press your left heel into the floor. Grab your right big toe with your right hand, then straighten your right leg out in front of you. Push your foot against your fingers to deepen the stretch, holding for a few breaths. Switch legs and repeat.
H2O + Triangle
Holding the pool wall lets you stretch without having to hold yourself up.
Stand arm's length from the wall with your right arm straight and your right fingers touching the wall. Spread your legs 3 feet apart and bring your left arm up, bending to your right. Try to reach your left hand over to touch the wall and push your left foot down. Hold for three breaths, then repeat on the other side.
H2O + Backbend
The buoyancy you have in the water makes getting into the backbend easier, so you can better stretch your abs and chest.
Stand with your back to the pool wall, about 2 or 3 feet away from it. Then, arching backward, look up and reach your hands behind your shoulders to grab the wall. Breathe, holding the stretch. Then move your feet back slightly and hold the position for a few breaths. Relax into the stretch.