This meme might be considered funny or clever because it plays on the idea of unsolicited pictures, which are often frowned upon, but in this case, is humorously applied to an unexpectedly impressive display of leg muscles, suggesting a level of pride and show-off culture in the fitness community. The contrast between the typical negative connotation of 'unsolicited' and the harmless, even comical, bragging about one's gym results can create a humorous effect.