It is quite unusual for people to commit to on-going tai chi lessons. We get e-mails every week from different people that say exactly the same words: too busy, too many commitments, don't want to make promises.
Do they use a template?
The really sad part is that these same people are a physical (and often emotional/psychological) wreck. And the reasons why they're a wreck are the exact same reasons why they won't attend class.