Yes, there are a number of reasons that you should not attend the training.

1. If you are not serious with improving your basketball level, you should not attend the training. Here serious doesn't mean you must aim at joining the NBA, college or school team, serious means that you want to improve and are willing to pay effort to train yourself. Any leisure player can be serious with their sports, even they are 70 years old.

2. If you are forced by your parents to come, or you are not attending the training under your free will, you should not attend the training.

3. If you are under 18, you should seek for your parents or guardian's approval before joining the training. If your family do not support your ambition in basketball, you should try to explain until they will give their support to you. Basketball is a team game, and seeking the support of your family is a key to future success.

4. If you have some health problem that is not fit for exercise, you should only attend the training with doctor's consent.

You will have full refund if you have no improvement after you followed the coach's direction and practiced with your best effort.