Mario Lopez is showing off his muscles yet again – this time on the cover of the next issue of TV Guide, along with The Hills’ Audrina Patridge on his back. Inside, TV stars share their fitness secrets…

For instance, Mario Lopez shares his need to sweat, saying, “I never feel awake unless I’m sweating.” Yuck.

And Audrina Patridge shares this fitness tip with TV Guide readers: “I wear heels when I vacuum because it works my calves and my butt.” Uh-huh.