The gym featured in the movie was built by Adam Carolla and Oswaldo Castillo during Adam's years as a carpenter. After completing the gym, Adam instructed the morning boxing class and Oswaldo was hired as the maintenance guy.
The film was going to be released straight to DVD until Adam Carolla insisted that the movie be released in theaters and put up approximately $300,000 of his own money for prints and promotion to fund a limited release.
The gym used in "The Hammer" is the same gym used in Showtime's Ray Donovan (2013). Confirmed by Adam Carolla on Twitter.
Adam Carolla has gone on many rants on his podcast about the film's rating. Despite just one use of the f-word and minimal cursing, the movie is still rated R.
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