When people first try the combat swimmer stroke, a fancy nickname for what is really a modified side stroke, they can often look silly. Even swimmers have issues with this stroke. Athletes and non-athletes both share a few weeks of difficulty getting the timing down of this common stroke used by Special Operations communities.
Here is a series of students who did not know how to swim very well in the first place, yet alone the Combat Swimmer Stroke.
Video #1: First time swimming the CSS after a brief demonstration. As you can see from this video, the student is trying to get the sequence and timing of the stroke down: top arm pull, bottom arm pull and breathe, kick and glide. Kicks / arm pulls / breathing are not working for him in video #1.
Video #2: Getting the stroke together — almost. The student is getting the timing down of the stroke but still needs work. Notice he is naturally trying to do a breast stroke kick so we can change from scissor kick to breast stroke to propel this stroke better.
Video #3: Not bad — Getting better. The student has moments of putting it all together and is just a few hours of swim practice of mastering the timing and sequence of the stroke. Now he has to work on his swimming endurance and speed.
Video #4: Swimming faster with breast stroke kick. Here is a different student who has a much better use of the breast stroke kick than the student above and has worked through all the same issues as above.
Video #5: Swimming the CSS about as fast as you can. Here is how I recommend learning the combat swimmer stroke using the scissor kick vs the breast stroke kick. The reason I like the scissor kick is that you will swim 99% of your swims at BUD/S and other Special Ops training programs with fins and you cannot swim the CSS with fins using a breast stroke kick. This version of the CSS is the same as you would use if you have a pair of fins on.
Video #6 — Swimming the CSS with fins. A big kick and little flutterkicks will be your main propulsion method when wearing fins. Some people alter the method of how they swim their strong and weak sides. You need to find what works best for you and master both sides of your body when swimming miles with fins.
The only way to get better at swimming any stroke is to practice. Practice not only your techniques and skills, but also you have to build up your endurance and stamina to last longer moving fast in the water. So keep it up and good luck and practicing the CSS.