Kettlebells are AWESOME! I avoided kettlebells for a very long time up until these past few years. Talk about a game-changer. Kettlebells allow you to do some crazy movements that'll challenge your body in ways that you didn't think possible. Kettlebell swings are towards the top of my list. Not only are they great for glute strength/power, but it has a carryover effect for teaching proper hip hinge mechanics, and is a great tool to add in for high intensity conditioning. Turkish get ups, windmills, clean and presses, one-armed presses, goblet squats (great for beginners), and many other exercises challenge you in a unique way. If you haven't tried training with kettlebells, I recommend you start now.