Yogis know it. Toddlers use it. Tightrope walkers swear by it. Yep, it's all about balance.

"You need to train your balance like you train your muscles," says Prevention's fitness expert Chris Freytag. "It's a use-it or lose-it skill." So let's definitely not lose it, shall we?

This week's exercise -- lunge with knee raise -- is targeted to challenge your balance while toning your core. How? When you offset your balance, your core muscles fire up to help you stabilize, says Freytag. So while you already know that lunges are an all-star move for toning your butt and legs, this intense variation gives you a core workout as well. (What do you want to work on -- your belly, thighs, arms, all of the above? We've put together the 5 Best Workouts For Each Part Of Your Body.)

If you're a little wobbly, try this tip: Find a focal point in front of you and keep your eyes glued on it throughout the exercise. Wandering eyes throw off your center of gravity.

Watch how to do the lunge with knee raise with perfect form!


(Love your lower body with our No-Squats Belly, Butt, And Thighs Workout .)