OK, so maybe it's not quite that simple. There are a few good reasons why your pants may be too low:
But it's almost 2016. You're probably not sagging. Your problems probably look a bit more like this:
But there's a better way to live, and it starts with understanding rise.
Rise is the distance between the crotch seam and the top of the front waistband.
This determines where your pants sit on your waist, which is the CRUX OF THE ENTIRETY OF YOUR OUTFIT.
Check the fine print when it comes to rise to figure out what pants you should get.
Your pants should hit at your actual waist, which is just above your hips.
And if your pants are too low-rise, you literally can't pull them up to the proper height.
How will you know they're too low-rise? When you try to pull them up, you'll squash your balls.