I was in attendance for the AT&T National being hosted at Aronimink back in 2010, the year Justin Rose won it. It was also one of Tiger's first tournaments back after the scandal the year prior.
Anyway... I watched Vijay for a few minutes at the range, and he was striping his irons. He was peppering the flag at about 190 yards out. He'd hit 3-4 balls with a cut swing, and the ball would land around 15 feet from the flag. Then he'd hit 3-4 balls to the same flag with a nice little draw, same results. Then, as if that wasn't impressive enough, he started hitting driver off-the-deck... The end of the range had to be 350 yards or longer, and the balls would land around 60 yards short of the fence. Keeping in mind, he was using a 460cc deep-faced driver... yet he was barely taking a divot.
It was impressive, because Vijay had to have been 47 or 48 years old at the time. Still had a long, rhythmic swing.