TrainerCentral allows you to offer any lesson in your course for free to your prospects. You can have them view a few lessons for free, understand the value that your course offers and then decide on purchasing the course.
Once selected, your prospects will be able to view the lesson after signing up to your academy without purchasing the course. This way, they can experience a lesson, assignment or even a live session for free and understand why purchasing the course might be of great value.