Monday Tai Chi class continues weekly at BAX, 421 Fifth Avenue in Park Slope, from 1:00-2:15. Fundamentals are built into the warm-up. Learn short Yang style forms. Improve balance, increase strength and mindfulness, enjoy the flow. Small class, all levels. $10 trial class, $20 per class, series rates. www.MovingChiBrooklyn.com. 718-686-7159.