swim lessons

When you pay for swim lessons, do you pay one lump sum? or by the lesson? does it make any difference at which level the lessons are? Are those lessons for an hour each? Some swim lessons have only been for a half hour. How much is aerobics? Again, by the session, or a block or week of sessions? It has been said that aerobics is no longer a viable and functioning program, and hasnt been for a while. Most of the main aspects of the resume in question have been posted here. What more is required?