Given a sentence, generate a most likely context or previous statement. The previous statement should be relevant to the given statement.

He demonstrates some of the correct moves to properly roller skate.
A man talks about the best practices to prepare to roller skate.

a group of friends are standing on the field and above them the man is climbing the rock wall.
Man is climbong a rock wall atached to harness.

They run up and down the court trying to score and keep the other from scoring.

The team in black is trying to prevent the other team in red from scoring, the goalie blocks the score.