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It's well-known among trainers as a tactic to trap blood in the arm, causing lactic acid to build up, triggering the release of a growth hormone.

The device caused the veins in his arms to noticeably protrude. The technique, also used by athletes in the Tokyo Olympics, involved wrapping rubber bands around his arms before a weight-lifting session - typically dumbbell curls. He did this by tying an elastic band around his arm to build up lactic acid while lifting.īut Hemsworth's trainer says the actor is not doing this anymore, and that it was "quite painful."Ĭhris Hemsworth has stopped using a muscle-building practice that he helped popularize earlier this year.īack in September, Hemsworth posted a video on Instagram of him using a technique called blood flow restriction training to increase the muscle mass in his arms to play Thor. Chris Hemsworth and Luke Hemsworth attend the premiere of Disney And Marvel's 'Thor: Ragnarok' on Octoin Los Angeles, California. Chris Hemsworth in "Thor: Ragnarok." Disney/MarvelĬhris Hemsworth was using blood-flow restriction training to build his arm muscles.