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Structure: this log book per week (create a Week 1, Week 2, etc. heading), and add individual team member sections by adding your full name for each week.
Content: Maintain a simple list of bullets with brief but specific descriptions of each activity that you worked on that fit on 1-2 lines max (do not write paragraphs). You should think about all the different things that should be worked on such as coding, modifying, updating, testing, designing, analyzing, writing, etc. Each item (bullet) in your log book should have the form: <bullet><date>: <activity-description>. A good example would be:
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