You can do it two ways. you can charge for the entire time it takes you to drive and train or just charge a little extra for gas. I charge $60 to go somewhere and train and $50 to train at my gym. I don’t really ever get anybody that wants me to go their house anymore so I don’t make it a big deal. If it takes you 30 min each way then that is time you could be scheduling another client. I think it fair to charge for the time it takes you to get there and back.