Since swimming is all about technique, drills are important for learning proper body and arm positioning. For beginners, drills should take up a large portion of their pool time. Advanced swimmers may work on drills only in the off season. Here are my favorites:
One-Arm Swimming
This is swum like regular freestyle, but only one arm is moving for each length of the pool – allowing you to focus on and placement in water, the pull, and body rotation. The other arm is stationary, either out front or against your body. Practice this drill with the stationary arm in both positions. When your stationary arm is by your side breath towards that side (away from the moving arm).
Fist
This drill allows you to feel how the pull part of your stroke is important and to get maximum efficiency. It is swum like regular freestyle, except you hold your hands in a fist. Go back and forth between fisted and normal to feel the difference.
Work on pressing the water with the inside of your forearm. With the elbow high, see how much of a paddle you can make with your arm.
Kicking
Kicking without a kickboard will allow you to perform your kick in the same body position of the stroke. Kick on your side with your bottom arm (the one closer to the bottom of the pool) extended straight out of your shoulder line before your head. Keeps your palm facing down and your extended hand about 8 inches under water. The top arm (the one on the surface of the water) should be relaxed at your side with your hand on your hip and out of the water. Press your upper body toward the pool bottom to get your hip at the surface of the water.
You can either swim one length of the pool on each side, rotating your head and body to breathe. Or you can alternate every 5-10 strokes, doing a slow swim stroke to get to the other side. I like to use this switching of sides to do a mini fingertip drill, slowly dragging my fingertips across the water before I switch to the other side.