Pop quiz! What’s the biggest muscle in your body? That’s right, it’s the gluteus maximus, one of the three glute muscles in your butt. It’s not just there to look pretty—it’s a workhorse that it pays ...

You might think the biggest muscles in your body can be found in your legs or back, but that title actually goes to the gluteus maximus; a pair of muscles that make up the bulk of your backside.

The following is an excerpt from the new Men's Health training guide 90-Day Transformation Challenge: Arms. In one volume, you'll get all the tools you need—information, a nutrition guide, and ...