Here's an easy way to rock toned arms by Christmas.
Hold a dumbbell in each hand and stand with your feet shoulder-width apart, arms at your sides, palms in. With arms straight but not locked, raise the weights diagonally in front of you, so that your arms form a V shape, until your arms are parallel to the floor. Hold for one second, then return to the starting position. Do 12 to 15 reps.
Holding a pair of dumbbells just above your shoulders, palms facing each other, stand with your feet shoulder-width apart, knees slightly bent. Press the weights until your arms are straight overhead. Hold for one second, then take three seconds to lower the dumbbells back to your shoulders. Do six to eight reps.
Stand with your knees bent and lean forward slightly, with a dumbbell in each hand. Bend your right elbow to bring the dumbbell to your side, making your upper arm parallel with the floor. Press the dumbbell back, and as you straighten your arm, rotate it so that your palm faces the ceiling. Rotate it back so that your palm faces in, and return your arm to the bent position. Do 12 to 15 reps with each arm.