Yes, but I do not think of it as a free session.
I use it as an assesment time to talk about a clients past, nutrition, injuries, experiences in the gym and goals. This helps me to create a program unique and perfect for each client.
Its a time for me to show them I am a professional and can help them. People have a hart time buying training because they can “hold” money, but cant “hold” their training. Its the perfect time to show them they are getting a bargain by purchasing time with me.