When you get darn spiffy at drills like this one and the FAST, you might considering working in longer distances and multiple targets. In the early days of PF, virtually every drill involved one target at 7 yards. Shortly after shooting my first sub 4 FAST, I first set up an accelerator drill with targets at 10/15/25. It was ugly, and I realized that I had become over specialized at single target, 7 yard drills.