For anyone trying to learn front-crawl - the reason a lot of you will be finding it hard is because your legs will be dragging in the water to far below your front-half - it gets to a point when you will feel like you´re pulling dead weight! (and you will be EXHAUSTED)
My advice is simple and I know this from taking on a triathlon a few years ago. I was like you, struggling with front crawl, but I had no choice but to persevere as I needed speed in my race. A good friend of mine who was a swimmer suggested I put a flotation device between my legs. This kept my lower body higher in the water and all of a sudden I found that my speed increased rapidly and I wasn´t as tired. After this I just worked on my breathing - taking it easy and not pushing too hard. Then it just all starts to click.
If you persevere with this it will come and you will really begin to enjoy swimming front crawl and fast!!
Good luck.
Hello , I did coach a few triathletes before(few years back) and I have to say putting a pulling buoy is almost like a quick fix, but it is not exactly fixing the core problem if your aim is to do triathlon .
It will help a lot in your normal training swim , but once you pull out that buoy, you are helpless once again.
To fix the real issue, it really takes a lot of stretching (plantar flex) and getting the kick rite; it is not exactly a kick as I always tell my students back then , it is a whip .. you whip and then you relax. If you kick up and down (uses energy), your leg will end up very stiff, coupled with the stiff ankle which result in not catching enough water, your legs will sink .
now when your leg sink, the effect is two fold. first it creates drag, secondly, you are not propelling yourself forward.

. So once you fix this, your speed increase tremendously.
Also , another reason your leg might be sinking is because the breathing. Natural reaction for beginners are to lift the head up and breathe.
When you lift your head up , your leg will sink ( physics

)
So , a good instructor should be able to help you /teach you breath the rite way. Well in fact , first lesson should be breathing , just water bobbing exercises. You wont know how important is this first lesson
as for breathing, contrary to popular believe

, it is not turning your head , it is rotating your body so that you can steal a breath ( almost un noticed )
look at the TI video posted by someone here and you will know what i mean
Anyway , I am transitioning from my competitive swim style to TI swim now, it is harder than I thought , I have to unlearn and relearn everything. Swimming it not easy at all, it is actually very technical , so technical that it is almost an art to master it.
