The video from Federer was taken when he was still a junior, big difference. Have you ever seen a training session with Federer from Dubai in the off season where he flies in 3 top juniors or other players and takes them on one by one in the heat while they drop like flies and he's still going?
The Nadal video is an official video released by the Nadal camp, again thats different.
The Djoko - Todd Martin video, geez I'm not surprised he's no longer his coach lol
This to me is the only real training video that I've seen out there being released and even that doesn't show too much. There's a series of them, about 3 or 4 maybe? Can't remember now http://www.youtube.com/watch?v=BpNFxnShJ9o