As funny and fierce as these BuzzFeed editors [1] may look — striking a pose in an attempt to re-create some very iconic Calvin Klein underwear ads [2] — their goal is actually pretty inspiring.

The men, who agreed to strip down to their boxers and pit their own abs against the likes of Marky Mark and Justin Bieber [3], wanted to celebrate their bodies, even if their muscles aren't as chiseled as a sexy male model [4]'s.

Read on to see how Isaac Fitzgerald channeled Justin Bieber and Kevin Smith channeled Mark Wahlberg [5], then click over to BuzzFeed [6] to see even more shots of this courageous group of dudes, along with their quotes about the experience.

Justin Bieber's Calvin Klein Ad

Isaac's Re-Creation of Justin Bieber's Ad

Mark Wahlberg's Calvin Klein Ad

Kevin's Re-Creation of Mark Wahlberg's Ad

Justin Bieber and Isaac Fitzgerald in Their Calvins

Mark Wahlberg and Kevin Smith in Their Calvins