Antonio Silva

Greg Hardy's training MMA at an elite gym in Florida ... but how does he look, and is he any good? Now we know ... 'cause TMZ Sports has exclusive video of a Friday afternoon training sesh at American Top Team ... AND an interview with his training partner, Antonio "Bigfoot" Silva. We asked…

His hands are almost TWICE THE SIZE of a regular human's ... but UFC badass Antonio "Bigfoot" Silva tells TMZ Sports his gigantic mitts don't hold him back -- they give him a HUGE edge in a fight. It's obvious why ... the Brazilian-born heavyweight -- who's in Vegas for UFC International Fight…