Looks like the technology they use for video games. The game designers cover real people with these white dots, then they get them to act out a sequence of movements. The dots serve as markers for limbs, parts of the structure, face etc and are charted and recorded on the computer. Then they are translated into graphics to allow for "realistic" movement for the characters in the game.
I'm not that geeky I promise you. I saw this on the making of "Jackass: The Game" on MTV.
In Manu's context, I'm guessing the Spurs or doctors are using this technology to record his foot's movement during various activities (shooting, running, cutting etc) and analyzing the charts. They're probably trying to see which aspects of his movement produce the most stress and unnecessary stress on his foot, then trying to correct that.
I'm no doctor, but this sounds like a logical thing to do with a person you're investing millions in. It's like when you go to get insoles, and the doctor has you walk on a special pad to record your impact zones and designs the insole accordingly. Like that, but about 100X more expensive and accurate.

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raspa said in two words all of what took samr four paragraphs to say!
