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You can stream Karate for Life (1977) on Shout! Factory Amazon Channel with a subscription.

The last of the Masutatsu Oyama trilogy. Oyama takes a job as a professional wrestler in Okinawa, but when he discovers that he is expected to take a dive, he quits in disgust. However, when a friend finds herself in desperate need of medical supplies, Oyama steps back in the ring to raise the money—but will he be able to follow the script this time?

A ferocious physical presence turns every choreographed brawl into a genuine struggle for survival. This final chapter trades pure martial arts discipline for the sweaty, rigged chaos of the professional wrestling ring.