Final answer:
The most effective method of goal tracking for Brian to use in gaining muscle is tracking performance.
Step-by-step explanation:
The most effective method of goal tracking for Brian to use in his pursuit of gaining muscle would be tracking performance. By tracking his performance, Brian can monitor his progress in terms of weight lifted, repetitions completed, and overall strength and endurance. This method allows him to assess his improvement over time and make adjustments to his workout routine or diet as needed to achieve his muscle gain goals.
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