Dumbbell Shoulder Press on Swiss Ball

Balance on a fitness ball and rest the dumbbells on their ends on your knees.
 
Start with the dumbbells at about chin level with your palms facing away from you and your forearms perpendicular to the floor.
 
Press the dumbbells up along a straight line toward the ceiling until your arms are fully extended.
 
The entire motion should be performed in a smooth, controlled manner that lasts about 3 seconds, with the downward movement no faster than the upward.
 
Do not lock your elbows at the top of the movement and do not bounce at the bottom of the movement.