PC version Fans have made a PC version. Some are still early, so read the project page first.
Fans took Muscle March apart and rebuilt it so it runs natively on a computer, often with widescreen, higher frame rates and mods. Here is the project we know about:
Unofficial native PC port of Muscle March (WiiWare) via static recompilation: macOS, Linux, Steam Deck, Windows. Requires your own copy of the game. Beta.