Uneven Arm Hold with Arm Fly - Get into an elbow plank position. Raise your right arm in front of you so it's parallel to the ground and lift your left leg at least two inches. "Fly" your arm and leg out, moving them away from your head and body, then reverse back to the starting position. Drop down, then repeat with the opposite arm and leg. That's one rep. Do 15.
Most of us ,especially women have problems to have lean arms. Here are some tips to achieve leaner arms ..but don't forget to apply Sweet Sweat before doing this work-out to achieve better results even faster :)