Final answer:
The technique performed on the ends of the hair that allows for mobility, softens the ends, and blends weight lines is called trimming.
Step-by-step explanation:
The technique performed on the ends of the hair that allows for mobility, softens the ends, and blends weight lines is called trimming. Trimming involves cutting a small amount of hair from the ends, which helps to remove split ends and create a more polished look. This technique is commonly used by hairstylists to maintain the health and appearance of the hair.