Exercises are arranged in categories, and most exercises will fit into more than one category. If you know what category or body part an exercise might be under simply use the drop down menu to look for the appropriate one. Your selection will take you to a list of all exercises in that category. You will also find some of the products listed with their exercises on the main Exercise page. Click on the 'Free Exercises' link at the bottom or top of the page to go there.
The keyword search can work simply by entering a word like 'balls' or the words 'exercise' and 'balls', this will give results that contain both these words. To refine your search you can use quotes, 'exercise balls', this will include results with only the string exercise balls.