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One secret to swimming faster freestyle is to rotate your body. Rotation can be a challenge for some but after reading this tip, you'll see that it was never supposed to be hard. The tip is quite easy to understand and do.
First, what is body rotation and why rotate in the first place? Optimally, when not in a rotation, the swimmer's body should be straight and parallel to the surface of the water and the bottom of the pool so it can stream through the water with less resistance. Rotation is when the body (maintaining the parallel) turns to the side, giving the body even less resistance.
I've used the pencil analogy in previous posts, but for this example I'm going to suggest using a ruler. Hold the ruler by either end with the length of the parallel to the floor and with the scale so it is facing the floor. Now turn the ruler so the scale faces the wall. Now turn it down to the floor again and make the scale face the opposite wall. Now imagine doing that with your body in the pool. Repeat. Repeat. Repeat. That is rotation.
So why should you rotate? Rotation puts your body in position to have less resistance as it passes through the water. Notice from the ruler demonstration that when the scale is facing the wall, the shape of the ruler is more like a knife (or a fish). This position also puts you in position to have a more powerful pull stroke.
Now just do this in the pool. When you extend each arm ahead, be sure to reach beyond the center point where the wrists would cross if they were there together.
What this does. The extended reach past the center point will force your body automatically into the rotation you are wanting to achieve. If you don't find yourself rotating enough, extend your reach further (i.e. hyper-extend). Enjoy!