Vin Diesel is all set to take on a new project! According to Deadline, the 53-year-old actor is joining the cast of a new action-comedy titled Muscle. Details about the plot are being kept under wraps and production of the movie is likely to begin later this year.STXfilms is going to produce this movie along with Reginald Hudlin and Byron Phillips, Vin Diesel and Samantha Vincent.