Individual attention. She should ask if you have any injuries or medical problems and modify poses accordingly.

Connection. Do you like her? Does she call you by name? Does she converse with students one-on-one?

Approach. Yoga is more about calming your mind than getting your butt into shape. The “seven limbs” of yoga include work on breath, meditation and other ways of living, and a good yoga teacher should be well versed in all of these.