It seems there are no limits to working out these days, with exercise studios offering more choices and fewer excuses for not keeping the body and brain in good shape. Following the launch in March of its Indian dance classes, Planet Yoga now introduces a cardio yoga class which combines a physical and mental workout. Cardio yoga burns fat quickly and is good preparation for endurance training, according to the studio. It says rapid leg and hand movements help trim waists and tone buttocks, while the yoga aspect balances the glands that produce hormones, and improves flexibility. Call 2525 8288 for details.