The Tacoma Mall will be the site of a free yoga class at 1 p.m. on May 18. The first 400 people receive a free yoga mat. The event is sponsored by Molina Healthcare whose spokeswoman says the program is designed to introduce people of all ages to yoga as a form of exercise, chronic pain management and stress reliever. The class will take place near the entrance to Macy’s. More than 100 children from the Boys and Girls Clubs of South Puget Sound plan to attend.