Hatha Yoga
  The physical practice of Yoga based on Pranayama (the science of the breath)  Hatha Yoga refers to the HA-breath of the sun (through the right side of the body) and the THA-breath of the moon (through the left side of the body) in harmonious balance.  The word "Yoga" means to yoke or join together.  Physical postures help harmonize the breathing process.

 The practice of yoga postures (ASANAS) aims to open and purify the energy centers (CHAKRAS) and energy channels (NADIS).
Taken from an excellent site shivashakti.com

Best to get a book out of the library on Hatha yoga (that is the postures or Asanas). Hatha yoga, is stretching the body, don't strain yourself, Hatha helps bring balance with your breath and body movements; Hatha yoga helps us to be flexible and its fun.

 Be a lion, kneel with hands on knees, tighten face, then roar like a lion, or stretch the tongue out to the chin. Be a lion.

Be a bow and arrow, my two year old likes this one, lye on your stomach and pull your arms back to your feet, rock. Pull your head back, feel the stretch.

Stand like a tree, feet together, straight spine, breathe with the trees, nice to do out side. Breathe feel the energies of the earth in your feet, rooted, sucking up the life force into your self, stretching out your branches, feel the currents round you, feel as a tree. Balanced well rooted, strong. home to life.

Be a fish, sit with your feet on either side of your bottom, bottom on the ground, then lye back. raise your hands above your head in a diamond shape. feel the pull and currents like water waving through you.

Be a snake lye on your stomach, legs together, hands either side of your shoulders, then pull back poking your tongue out down to your chin.

Sit crossed legged and roll your head slowly round, chin to chest, left ear to left shoulder, back, right ear to right shoulder, chin to chest..... then rotate in the other direction. Arm are rested on knees or lap.

Be a mouse roll body into a little ball and roll around the floor.

Be a cow try to touch hands behind your back. with one arm over your shoulder and the other behind creeping up. change position with your arms. Keeping your stretches balanced. I'm not sure why that asana is called a cow.

After a few stretches always end with a still pose, such as the mouse or corpse.  Lye on your back, arms to your sides palms up.  Imagine yourself floating like a cloud. When ready slowly sit up.

When doing Asana's it is important to not tense your body, but hold each posture as still and quiet listening to the feelings within.  Move on the out breath. Keeping a straight spine, body balanced.  It is best to get a book on the subject to do it right and well. But remember to have fun and don't stress yourself. The idea is be flexible and balanced.