Mark Miller has been training his ass off since making his big comeback in May knocking out Nikolaj Falin in just under 9 seconds. It was one of those moments that was almost too perfect to sum up. Since then he has been training just as hard waiting for his next fight to come together, and this training also included making a special appearance at Rampage Jackson's training camp as a sparring partner and coach for Rampage in his upcoming fight. Regardless of the whole, ridiculous "spygate" non-scandal that has been talked about for Rampage's training camp, a lot of actual work was done and Mark helped push Rampage to his limits.
Since then he has been training using the Mass Suit, something almost out of a science fiction movie that was made to help athletes maximize their workouts by providing extra tension. This video is of Mark working out with the suit and they interview him for some background information as well. [source]