Which Muscle Contracts during the pose? Rectus Abdominis, Transversus abdominis, Deltoideus Anterior, Erector Spinae, Triceps Brachii, adductor muscles, anterior tibialis. Which Chakra does it activate? muladhara (root), Swadhisthana (Sacral) 1 Spiritual, 1 physical and 1 mental benefit of the pose. Physical Benefit: Strengthens Quadriceps and Glutes Tones Core Muscles Stretch