thank you for your reply. I am thinking to do that. I felt the t-shirt wasn’t a good idea. I did bring electrolytes water with me. I think, I didn’t drink enough water period to the class. In addition, I felt my instructor wasn’t good toward students. Since, the first class was free for the first time student. The instructor wasn’t good toward many new students(about 6 new students). I will go to another instructor probably next week. Hope for better.