Remember that first position is done with both arms extended forward, elbows out, and palms down. To explain this position to children, teachers often tell them to pretend they're holding a beach ball out in front of them. The shoulders should be a little higher than the elbow, and the elbow should be higher than the wrist. This position is often used during turns to keep balance centered.
Know that second position is done with the arms extended to the sides. Your elbows should face back, and your palms can face either up or down. You will use this position during moves that require more balance and sometimes during jumps.
Keep in mind that in third position, one arm is extended to the side and the other comes forward. This position combines positions one and two. This move is very often used when performing pirouettes because the extended arm helps you to gain momentum.
Know in fourth position, one arm is extended to the side and the other is raised above the head. You should be able to see the tips of your fingers in your peripheral vision. If your above-the-head arm is too high or two far back, your posture will be out of alignment.
Remember fifth position is done with both arms raised above the head. Basically, you can take first position and raise it up. Your elbows should be slightly bent, as well as your wrists. The common problem with this position is raising your shoulders when you raise your arms. Make sure you keep your shoulders down.