Kilts aren't exactly a mainstream clothing choice nowadays. But, Twilight's Cam Gigandet was recently spotted wearing a kilt and, frankly, I think he looks pretty hot. I'm not alone in thinking that, either. Most of the comments People readers left at this site are positive, too. But to sport a kilt, a guy has got to have some pretty rocking calf muscles ... not to mention guts.

Designer Marc Jacobs says that wearing kilts makes him happy and that he "just can't stop wearing them." And just think of the movie, Braveheart -- if anyone can look hot in a kilt, it's Mel Gibson.

Men's Fitness has some great exercises to help get your calf muscles in great shape:

• The Siff Squat
• Calf Raises
• The Justice Routine (American Gladiator, Winston Justice's routine which includes several calf exercises.)