Final answer:
Flexibility is the measure that describes how far your muscles can stretch. It is different from muscular strength and endurance, and can be improved through specific exercises like stretching, yoga, or Pilates.
Step-by-step explanation:
The measure that dictates how far muscles will allow the body to stretch is called flexibility. Flexibility is essential for a full range of motion in the joints and helps in preventing injuries. It can be improved through exercises such as stretching. Examples of these exercises include yoga and Pilates, which not only enhance flexibility but also contribute to overall physical fitness.
It's important to differentiate between other concepts such as muscular strength, which is the ability of a muscle to exert force during a contraction, and muscular endurance, which is the muscle's capability to continue contracting over time without fatigue.