Duplicate exercises to make easy, medium versions, etc.

Some workout plans have as many as three levels of effort; hard, medium, easy. If you swap a supplied exercise for a custom exercise in one of these plans, you'll need to create three versions of the same custom exercise (i.e. hard, medium, and easy). There needs to be a way to duplicate a custom exercise so that all you have to do is edit the name to have the appropriate version to swap into your workout. Also, this would make it much easier when you need to create a custom exercise for a different (but similar) machine at the gym, or exercise variation, since the weight and reps often aren't comparable between variations.