Fill in the blank (_) in the following sentence from the following choices.
Sentence: Lila practiced doing a handstand in a pool instead of against the wall because the _ made moving around strenuous.

Choice 1: Lila practiced doing a handstand in a pool instead of against the wall because the pool made moving around strenuous.
Choice 2: Lila practiced doing a handstand in a pool instead of against the wall because the wall made moving around strenuous.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
1.