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The best tool for lean legs: BOSU balance trainer

Lean-legs move: Reverse Lunge with Touch-Down

Here's why: "A reverse lunge works both the quadriceps and hamstrings, plus the movement helps you build balance and agility," Dixon says. Add in the instability of the BOSU and your muscles have to work even harder to complete the exercise—so you get better results in less time. "You'll definitely feel the burn while doing this move!" Dixon adds.

Next: How-to: Reverse Lunge with Touch-Down