Just a few days ago we saw Kobe Bryant training on an anti-gravity treadmill.
Naturally, LeBron James couldn't be one-upped.
While Kobe is rehabbing a torn Achilles, LeBron's reasons aren't so clear.
Perhaps it is intended to speed up the training process. Regardless, the (presumed) oxygen mask is a pretty cool add-on.
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Article written by Jake Silver