I've done this once or twice at a pretty small dose (10-20 mgs) and I've had incredible workouts. Outside of this I don't use stims since they don't do **** for me. I find that methylphenidate @ 10 mgs has little effect on my pulse/blood pressure (I have an Omron cuff) so I'm not too worried about that. Only thing is the anorectic effects, so it would probably be better saved for cut.
Would there be any safety concerns with this?