Final answer:
The entire journal is meant to record a single day's activities, as indicated by the instructions for tracking diet and physical activities over separate 24-hour periods for analysis.
Step-by-step explanation:
The entire journal (first through last page) shall be used to record a single day's activities. The provided procedures indicate that a Food Diary and an Activity Report are intended to document diet and physical activities over two 24-hour periods. This suggests that each day's food intake and physical activities are separately recorded, with one being a weekday and the other a weekend day. Completing the 'totals' section of the Data Sheet for each day further supports this understanding that the journal is meant for daily, not weekly, monthly, or annual tracking.