Fill in the blank (_) in the following sentence from the following choices.
Sentence: The lifting improved her flexibility, while, strangely, the stretching did not.  The _ was just so effective for her goals.

Choice 1: The lifting improved her flexibility, while, strangely, the stretching did not.  The lifting was just so effective for her goals.
Choice 2: The lifting improved her flexibility, while, strangely, the stretching did not.  The stretching was just so effective for her goals.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.