Yoga serves two purposes for me. One is for stretching and the other is for strength training. Not all poses but some certainly does build muscle when done correctly.
List of Poses
Downward-Facing Dog
Upward-Facing Dog
Garland Pose
Forward Bend
Plank Pose
Seated Spinal Twist
Warrior I
Camel Pose
Cat Pose
Cow Pose
Crescent Lunge
Child’s Pose
Corpse Pose