It was the usual trimdownclub website. There was a man and a woman explaining about the exercises which were easy to do in a short time.
I would not have given my home address as they did not ask for it but they asked for my e mail details and bank card details.
I think it must be a scam and I am not good with computers. Thank you for your help anyway. Perhaps you could look into the second question some time and ask it I should have had a cookbook.