The body scan is a powerful meditation for increasing our awareness of the body, and it became an important part of Mindfulness Based Stress Reduction (MBSR), the mindfulness program developed by Jon Kabat-Zinn to help those with cancer and chronic pain at the University of Massachusetts General Hospital. You can find out more about his approach to the body scan in this document: The Body Scan Meditation. Palouse Mindfulness provides free and complete access to the MBSR program online. They have a number of guided meditations on their website, including the body scan meditation. You can find it here: Body Scan
Spirit Rock has a good introduction to the practice of mindfulness of the elements on their website. One major emphasis of the practice is to come to a better understanding of our identification with the body. When we can let go of even a little bit of that attachment, we can learn to view our life differently and experience a little more freedom. The Spirit Rock practice guide includes Dharma talks and guided meditations on the practice of the elements. You can find their practice guide here: The Four Elements