The Leventhal-Sidman Jewish Community Center (333 Nahanton Street) in Newton will offer an eight-week Tai Chi class for beginners on Mondays, April 4-June 6 from 9:30-10:30am. Tai Chi is a relaxing yet invigorating series of movements appropriate for all ages and fitness levels. The class is designed to help improve participants’ balance, coordination, body awareness, memory, focus, breathing, posture and overall well-being. No experience necessary. Open to the entire community. Cost is $170. Register online at www.bostonjcc.org/register. Free demonstrations will be held on Monday, March 28 at 9:30am (beginners) and 10:30am (continuing). A continuing level class will also be offered on Mondays, April 4-June 6 from 10:30-11:30am. For more information, contact 617-558-6459 or wellness@jccgb.org.