When it comes to working out, most guys focus on upper body vanity muscles and neglect their legs. But if you want to feel good running down the beach or showing up to a backyard barbecue in shorts, you'll want to tone up your legs. If you're skipping leg day at the gym, you're missing out on some big benefits. Because your lower body is home to some of your largest muscles. Which means you can burn more calories, boost your testosterone and shred body fat by working them properly. But let's get serious, right now you're simply wanting to look good in shorts, right? So whether you've got skinny toothpicks in need of strengthening or burly logs that would benefit from more definition, here's how to get your quads popping and calves sculpted for shorts season.