Category Events - United States, Woodstock (GA) Free Yoga Classes for students April 16th-April 20th. Sign up in advance on the Ember Hot Yoga App and bring valid student ID with you! Students may take unlimited classes between the 16th and 20th. Arrive 10 minutes early to assure your spot. Bring a mat or rent a mat at the studio for $2 cash. Open to full time students, ages 16-25.