The Aerobox

The Aerobox - works the shoulders

Stand holding a 1- to 2-pound weight in each hand.

Bring fists in front of face, palms facing each other.

Step left foot 6 inches forward and right foot 6 inches back.

Punch with left fist, then right. Start slowly, speeding up until you're going as fast as you can.

Repeat for 60 seconds.

Switch feet and repeat.
 

(courtesy of fitnessmagazine.com)