Get your heart pumping with this moves that improves coordination and strengthens the muscles in your legs, butt, core, arms, and shoulders.
How to do it: Hold a dumbbell in front of your right shoulder, palm facing in, left arm extended by your side. Take a wide step forward with your right leg and lower into a lunge, bending both knees about 90-degrees. Push off of your right foot, and as you step back to the starting position, press both arms overhead and pass the weight to your left hand. Quickly repeat the movement on the other side, stepping forward with your left leg. Continue alternating legs as quickly as you can for 1 minute.
Form tip: Avoid letting your upper body lean during the lunge and press; Keep your abs drawn in tight and use control during each part of the exercise. Add a challenge by increasing your speed (adding in more reps in the same amount of time) without losing your form.