Be honest with me here: You have one or even multiple friends who always post their gym activity to Facebook. Or maybe that person is you.

"Ran 15 miles before work! Yeah 💪" can be motivating to read in the morning or incredibly annoying, depending on how much you hate that painfully overused flexed-biceps-emoji.

Researchers from Brunel University in London have conducted a study as to why so many people share every workout on social media.

The results are unflattering, to say the least.

Addicted to attention and esteem

People who are always keen on documenting their gym activities (or every time you simply go for a good, old-fashioned run) tend to be narcissists. According to the researchers, the primary goal is to boast about how much time you invest in your looks. Apparently, these status updates also earn more Facebook likes than other kinds of posts.

"Narcissists more frequently updated about their achievements, which was motivated by their need for attention and validation from the Facebook community," the study concludes. The high number of likes doesn't necessarily mean everyone loves seeing those bragging posts, though.

Dr. Tara Marshal goes on, saying that "although our results suggest that narcissists' bragging pays off because they receive more likes and comments to their status updates, it could be that their Facebook friends politely offer support while secretly disliking such egotistical displays."

So unless you get creative in your workout, maybe hold back on those daily Facebook updates on your progress in the gym. Your friends will thank you for it.