Dr Jen Crane's blog is a resource for online exercises for mobility and performing. It is a great adjunct to this site's focus on the science and research behind how we move. As with any movement or exercise, focus on your form first and be sure you are moving where and how you are intending. If you have questions, concerns, or pain please contact a medical professional in you community or contact us for recommendations.
Dr. Dave Tilley works with gymnasts and has a great blog with education that is relevant to everyone in our community
Simply Circus is the everything resource. Steven Santos has compiled a bibliography of published literature on circus and links to "circademics" around the internet.