Here's another catch fault I often see in my Video Analysis sessions - an overglide. Overgliding versus initiating the catch straight away This term refers to the swimmer spending too much time lengthening out at the front, which actually serves as a brake, slowing you down rather than increasing stroke length. I've drawn yellow lines on the picture to indicate how the arm should be positioned in the water, to initiate the catch straight away. This may make the stroke feel 'shorter', but...
