Rob Kardashian Looking Beefy in a Tank Top (PHOTOS)

Those Kardashians sure do take their fitness seriously.

Rob Kardashian stopped by Whole Foods in Santa Monica on Thursday and showed off his guns in a white tank top. Khloe Kardashian hit the gym earlier this week with Nicole Richie, and a fresh-faced Kim got her workout on too this week.

Check out the gallery to see the rest of the pics.

Do you think Rob should cut back on the weights? Or is he in fine fighting shape? Hit the comments and let us know what you think!