Aching for downward dog? Eager for a sun salutation? Stop by this frills-free Boylston Street studio. Yogi David Vendetti transforms himself from teacher to comedian to storyteller to motivator, all while delivering precise, clear instructions. His 90-minute classes cater to both beginners and advanced students. Every body leaves Back Bay Yoga in balance. Back Bay Yoga Studio, 112 Boylston St., 3rd Floor, Boston, 617-375-0785, backbayyoga.com.