The single-hand dumbbell step-up is a great lower-body exercise that targets the quads, glutes, and hamstrings, while also engaging the core for stability. 

Holding a dumbbell in one hand adds an asymmetrical challenge, requiring your core to work harder to maintain balance and control. 

By stepping onto a bench or platform, you strengthen your legs and improve your coordination. This variation is excellent for building unilateral strength and muscle tone, while also enhancing functional movement patterns.