Shia LaBeouf Showing Off His LaBulge

9/7/2014 7:54 AM PDT

Shia LaBeouf -- Showing Off His LaBulge

Shia LaBeouf did his best impression of a teenager on the high school wrestling team Saturday in Studio City ... rolling around town in a killer pair of spandex.

The 28-year-old actor and his girlfriend Mia Goth hit the town for a lunch date and we're guessing he just finished some sort of aerobic exercise. Or maybe he's just incredibly fashion forward in a way us mortals just don't comprehend. 

In case the tank top looks familiar ... it appears to be the same one Shia wore during his extremely dramatic ice bucket challenge.