Stipe Miocic on Cormier's Secret Training with Steven Seagal, 'He's a Savage!'

Yep, Stipe Miocic has seen that footage of Daniel Cormier training with Steven Seagal back in the day ... but he ain't worried about it! The footage was shot back in 2015 when Cormier was getting ready to fight Jon Jones at UFC 182. Seagal -- who…