Yesterday I noticed that my right arm is croasing over my centre body line to the point that I can’t stop it.
I figure well pretty much know that its due to me having no strength after I get a bit tired.
I can swim the first 2k fine but then as I am tired it happens and I honestly caan’t stop it.
I can make it happen faster if I use paddles.
Ok - you’ve identified the mistake, so now you know when it’s happening. If you get tired when you’re swimming and start using bad technique, stop, take some recovery time and see if you can complete the session with good technique. If you do this a few times and it doesn’t work: get out, you’re tired and you’d be wasting your time swimming with bad technique. If you’re tired, you’re tired. So never knowingly swim with your right arm crossing over: as said above, you’ll cause unjury and imbalances.
You would develop a dominant and stronger right side, which can cause over-use and other injuries on that side as it may not be able to cope with the extra pressure placed upon it. Using paddles with a crossing-over arm action is going to exacerabate the extra pressure placed on your right side even more. In addition, you may have trouble swimming in a straight line in o/w conditions. Furthermore, the lateral deviation caused by crossing-over is wasting energy and you are moving yourself to the side instead of forwards, and you waste more energy countering this action with the other arm.
If you’re worried that you may drop mileage due to swimming less as you stop certain sessions when your technique goes awry, swim more often instead - again with no crossing-over at all.
Do you have a coach or someone to look at your technique? Doing coached session to correct this would be a good idea.
One point to help you avoid this tendency is to initially over-compenstate: it’s more mental than physical. At first, keep your right arm away from the midline, particularly at the point in the stroke at which you are prone to crossing-over. This will feel weird, odd and almost wrong to you. But persist, and gradually bring your hand to a more traditional point in the entry-catch-pull-push: again, all outside (but near, where appropiate) the midline. The main reason for this strategy is to develop a new style for your right arm’s progress underwater, you will have to experiment to find the one best for you. But stay away from the midline!
edit: I must point out that over-compensation can, very occassionally & if not done gradually, lead to secondary injuries if you are doing high volume, so the best option is really to see a coach to analyse your stroke.