Looping is pre-writing strategies for generating and clarifying ideas. It almost obliges you to focus on your ideas each time even harder in order for you to discover a writing subject.
It works this way: Someone loops for a couple of minutes of free-writing after another so that way you have a succession of free-writing where each is more specific than the other. After doing it non stop and without deleting anything, the person should read everything and look for interesting phrases, ideas and circle them. Do this last step 2 more times (It's called looping), each one being more specific on the circled topics and you are going to end up with a lot of specific information about the topic you are interested in.
Summarizing everything, the one step you can take when using the strategy of looping is that you free-write about chosen topics or subjects.