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The Australian actor, who is best known for playing Geoff Campbell on soap Home and Away, is believed to be doing five strenuous two-hour workout sessions per week in order to gain more muscle for a rumoured role in a Guy Pearce movie.
His trainer Cameron Mercer told The Daily Telegraph: "He does more on weekends. We do about two hours a day, sometimes more, without allowing too much rest in between sessions.
"He's very strong, physically, so does very well with weights, but he knows he needs to work on his cardio."
Lewis has previously had to train hard for Australian action film Tomorrow When The War Began, which was filmed last year.
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