UFC superstar Cris Cyborg’s got a secret weapon for her fight against Holly Holm — boxing legend Mia St. John — and TMZ Sports has footage of their intense sparring sesh.
Cyborg and MSJ traded shots for four 2-minute rounds at the RVCA gym in L.A. … and you can tell they were taking it seriously — even though Cris and Mia agreed not to go full beast mode before they stepped into…
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