Catch-up crawl with a kickboard is a fundamental drill you can include as soon as you’re able to breathe to the side and lie flat on the surface while kicking with your crawl legs. The advantage of using a kickboard is that it supports you while breathing – it’s important to learn how to breathe without letting the arm you’re about to stroke with drop down. Don’t be afraid to add the catch-up crawl with a kickboard early on and include it in every training session – start with just a few meters and gradually work up to several pool lengths.
It’s prepared for every level with printable images.
I recommend choosing color printing (the image gets lost in black and white), placing it in a sheet protector, and taking it directly to the pool.