When you were taking high-school math classes, you probably thought you'd never use that junk again. Then one day, years later, you were organizing the books for your new business, and blam: calculus.
When you lift weight, you may be confronted by that same question: When will I ever use this? It's not so much that you'll use glute bridges or step-ups exactly as you do in the gym, but you will use the muscles strengthened by these movements all the time.
Every time you climb stairs, you use your glutes. Every time you stand up, your posterior chain engages. Every time you get into a wrestling match with your little brother, you'll thank yourself for all of these front squats. Because, come on, you never want that punk to pin you!