Yoga For Beginners 30 Day Challenge Day 18. Today we're going to practice strengthening our core muscles and we'll practice some balancing poses including Garudasana (eagle pose). Toward of the beginning of our practice we'll make our way into table position, lifting the opposite arms and legs, then we'll draw the knee and elbow in toward center, engaging the core muscles, and practicing balance. When we extend the leg back, we're practicing keeping the hips level and the torso stable. This is more challenging than it looks but it's great to keep the back muscles strong! Enjoy your vinyasa practice and modify and rest as needed.