Final answer:
By holding a stretch for a longer period, you are changing the 'Time' component of the FITT formula, not the intensity, type of exercise, or frequency.
Step-by-step explanation:
If you increase how long you hold a stretch, you are adjusting the Time variable of the FITT formula. The FITT principle stands for Frequency, Intensity, Time, and Type, and it is used to guide the development of fitness programs. When you hold a stretch for a longer duration, you are increasing the time you spend on the exercise but not necessarily changing how often you stretch (frequency), how hard you stretch (intensity), or the kind of stretches you are doing (type).
In relation to other fitness components mentioned, increasing the intensity would involve stretching harder or using more force, and increasing the frequency would involve stretching more often. Altering the target would mean changing the muscle groups you are focusing on. Holding a stretch for a longer period does not inherently change these other aspects.