Burlington Mall, in partnership with the Athleta store at the mall, is hosting a “Resolution Revolution Health Expo” Saturday from noon to 6 p.m. in the center court area on the lower level of the mall, 75 Middlesex Turnpike. The expo will include three classes: a P90X exercise class at noon, a yoga class at 2 p.m., and a kettle bells and endurance Pilates fitness class at 4 p.m. It will also feature tables and booths with local vendors offering health information and products, and answering health-and-fitness questions. All classes require a $10 donation that will benefit Team In Training, a fund-raising program of the nonprofit Leukemia & Lymphoma Society. Space for each class is limited to 20 participants. To sign up, e-mail Emily Aarons at Emily Aarons@stores.gap.com.