This is a simple sculpt based on a M.U.S.C.L.E. toy from the 1980s; this particular model is based on the #141 figure of the 233 set.
The resin prints shown were printed on the Elegoo mars at standard 0.05 mm layer height with a 1:1 blend of Siraya Fast & Tenacious with heat controlled to 30 C. The chitubox presupported file is also included that I used for this printer combination.
If you want to know more about the original toys, the University of M.U.S.C.L.E has all the info you could want.
Let me know if you have any requests for sculpts based on these figures in the comments. Otherwise, I also uploaded the ZBrush ztl file (zipped) for those interested in the source. Feel free to use it as a basis for other M.U.S.C.L.E. figures of your own following the CC-BY-NC-SA license.