1. Start on your side with your body in a straight line
2. Raise up your hips to the top position
3. Your elbow should be directly underneath your shoulder
4. As you hold, make sure that your hips do not begin to sag

If you find that you need more support, you can place one foot in front of the other as I show here. If you need even more support or find that you have shoulder pain, you can place the top arm on the wrist of the other hand to add a little bit more support. A cue I find useful is to think about bracing your core as you hold the side plank as if someone was going to punch you in the side.