Fill in the blank (_) in the following sentence from the following choices.
Sentence: At the gym, Samuel was working out their legs while Brett worked out their arms. _ ran a faster mile because of the leg workouts.

Choice 1: At the gym, Samuel was working out their legs while Brett worked out their arms. Samuel ran a faster mile because of the leg workouts.
Choice 2: At the gym, Samuel was working out their legs while Brett worked out their arms. Brett ran a faster mile because of the leg workouts.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
1
1.