It is critical to train fly with excellent technique or it becomes what I call “butterstruggle” and is counterproductive. This set allowed is to get a decent volume of fly in while keeping it in manageable chunks. We allowed two versions of the set: The A is for our strongest flyers. The B is for our non-flyers or flyers without as much strength. Doing the set in “zipper” fashion allowed us to never half to “fly-dodge” or take one-arm strokes.