Hey, @Juice! I don't think such a model exists yet - at least, not to my knowledge. Proko's Skelly app (https://www.proko.com/skellyapp) is a great poseable resource, although it only shows bones in its current version. If Proko would be able to release a poseable model that also showed muscles, I think that would be awesome. But I'm not sure if this is in the company's near future plans - perhaps @Kimberly Lewis might like to add up any info?