Catch Position Roll + Freestyle Breathing - Front Crawl Technique
Flush means to have your forearm in contact with the side of your body (midline) so there are no gaps. If your forearm is not fully in contact your arm is not fully extended next to your body, holding the torso in a neutral posture.
Step 3 - Catch position and the Breath
The catch position is defined by the start and finish of the stroke. The catch position is when the stroke is at its longest. Learning the catch position progressions is key to establishing stability and the fundamentals of propulsion.