In FITT, what does I stand for?

• A. Ingestion timing
• B. Intensity of workouts
• C. Interval length
• D. Isometric strength

Answer: (B)

In the FITT principle, I stands for intensity—the level of effort you put into the workout. This dimension determines how hard the body is working during each session and drives the adaptations you’re aiming for, whether that’s improving endurance, strength, or power. You gauge it with indicators like heart rate, pace or speed, or the rate of perceived exertion, and you adjust it to match your goals and fitness level (for example, moderate to vigorous effort for cardio improvements, or higher resistance for strength gains). The other options miss the intended meaning: ingestion timing relates to nutrition, interval length is not the specified measure in this context, and isometric strength describes a type of muscle contraction, not the workout’s intensity level.