www.classfinder.org.uk makes it much easier to find cover for your fitness class.
You need to register for free and then click on the 'find cover' button. You will then be able to enter the class type, time and date and www.classfinder.org.uk will tell you who is nearby and available. You can then send them a cover request by email for free (or for a small fee you can send it by text).
Click on this link to visit the home page and register for free www.classfinder.org.uk