Was Ricardo Montalban's muscles real in wrath of khan?

Yes, Ricardo Montalban's muscles in "Star Trek II: The Wrath of Khan" were real, but they were enhanced by a special costume. Montalban had been an athlete and maintained a fit physique, but the character of Khan was further accentuated by the use of a tight-fitting, sculpted chest piece that emphasized his muscular appearance. This combination created a striking visual that contributed to Khan's menacing presence in the film.