Activity levels can be effectively tracked throughout the day using various methods including wearable fitness trackers, smartphone apps, and pedometers. These devices monitor metrics such as steps taken, distance traveled, and calories burned, providing valuable feedback on daily activity levels. Additionally, maintaining a physical activity log or journal can help individuals become more aware of their habits, set realistic goals, and stay accountable. By effectively tracking activity levels, individuals can make informed decisions to improve their overall fitness and health.