Triangle.

Stretches your sides, chest, and inner thighs
Tones your legs, arms, and torso
Beginner yoga students often allow their top shoulders to collapse downward in the Triangle, reducing the stretch along the sides of their torso. Using the ball, beginners can easily move into the pose.
A. Stand with your feet about 3 feet apart. Place the ball underneath your right thigh. Turn your right foot out 90 degrees and slide your left heel back slightly. Extend your arms from your shoulders.
B. Exhale as you bend to the right, sliding your right hand down your leg as you bend. Extend your left hand toward the ceiling and slightly behind your torso. Turn your head to look up toward the ceiling. Hold for 30 seconds, breathing normally. Inhale as you rise and then repeat on the other side.