Sit/Easy Position – Sukhasana

A starting position that helps focus awareness on breathing and the body; helps strengthen lower back and open the groin and hips.
Sit cross-legged with hands on knees. Focus on your breath. Keep your spine straight and push the sit bones down into the floor. Allow the knees to gently lower. If the knees rise above your hips, sit on a cushion or block. This will help support your back and hips. Take 5-10 slow, deep breaths. On the next inhale, raise your arms over your head. Exhale and bring your arms down slowly. Repeat 5-7 times.

Dog and Cat – Increases flexibility of spine

This is really two poses, one flowing into the other. Begin on your hands and knees. Keep your hands just in front of your shoulders, your legs about hip width apart. As you inhale, tilt the tailbone and pelvis up, and let the spine curve downward, dropping the stomach low, and lift your head up. Stretch gently. As you exhale, move into cat by reversing the spinal bend, tilting the pelvis down, drawing the spine up and pulling the chest and stomach in. Repeat several times, flowing smoothly from dog into cat, and cat back into dog.

Mountain – Tadasana

Improves posture, balance and self-awareness.
A deceptive pose in that it appears so simple that some students may ask – “why bother?” But just as there’s more to breathing than meets the eye, there is more to standing, too. Stand with feet together, hands at your sides, eyes looking forward. Raise your toes, fan them open, then place them back down on the floor. Feel your heel, outside of your foot, toes and ball of your foot all in contact with the floor. Tilt your pubic bone slightly forward. Raise your chest up and out, but within reason – this isn’t the army and you’re not standing at attention. Raise your head up and lengthen the neck by lifting the base of your skull toward the ceiling. Stretch the pinky on each hand downward, then balance that movement by stretching your index fingers. Push into the floor with your feet and raise your legs, first the calves and then the thighs.

Breathe. Hold the posture, but try not to tense up. Breathe. As you inhale, imagine the breath coming up through the floor, rising through your legs and torso and up into your head. Reverse the process on the exhale and watch your breath as it passes down from your head, through your chest and stomach, legs and feet.

Hold for 5 to 10 breaths, relax and repeat.
On your next inhale, raise your arms over head (Urdhava Hastasana) and hold for several breaths. Lower your arms on an exhale.
As a warm up, try synchronizing the raising and lowering of your arms with your breath – raise, inhale; lower, exhale. Repeat 5 times. Source