Final answer:
Fine-tuning a workout involves adjusting intensity and volume to avoid potential problems and maximize results, a concept emphasized by Dr. Jeff and Justin Sung in the program.
Step-by-step explanation:
In the context of Dr. Jeff's program, both Dr. Jeff and Justin Sung emphasize the importance of personalizing one's workout regimen by fine-tuning workout intensity and volume. This process of individual adjustment ensures that a person can avoid potential problems such as overtraining or injury, while maximizing workout results. Justin Sung refers to this individualized adjustment process in a workout program as fine-tuning, just like Dr. Jeff, although the specific term Justin uses is not provided in the question. It's crucial to listen to one's body and adjust workouts accordingly to ensure both safety and effectiveness.