catch up drills? really? reinforces bad technique…
Not for beginners, I disagree.
It helps to enlarge the stroke. Most of beginners, mainly those who never swam before, have a very short stroke and the increase their frequency instead of enlarge the stroke to swim faster.
Catch up drills, is only a drill to be done a few minutes and then come back into regular swimming to ensure a good pass of the feeling of feel the water caught by each hand.