Live ambient guitar gives this free Waterloo Park yoga class a soundtrack that changes with the movement instead of simply playing behind it. Collette Ouseley-Moynan guides an all-level Hatha flow, gradually cooling the practice into meditation while guitarist Cory Brim builds a spacious, carefully shaped set around the group. It is welcoming enough for a first class and distinctive enough to refresh a regular routine. Bring your mat, invite a friend, and let downtown feel quiet for an hour.