I would like to be able to fill out a questionnaire for each class I attended so that I can tell the trainer what I liked and might want to have them think about changing. Music selection, motivation, correcting form during exercise and general feeling of the class are areas that I would want them to know. Make it anonymous and provide each instructor with a summary of the week in a pie chart for each question. There’s got to be a way to automate that. Each question should have a five point scale from disliked very much to liked very much.