Being able to do the flutter kick is an important prerequisite for learning the front crawl / freestyle stroke.
The following article explains the movements of the flutter kick, and also proposes a few exercises to learn this technique (video included).
How to Flutter Kick
1) Let’s imagine that you are floating in the water in a prone position, with your legs extended and feet pointed.
2) To flutter kick, alternate kicking downward with one leg, a bit like kicking into a ball, while moving the other leg upward, and vice versa.
3) Start the downward movement from your hip. Slightly flex your knee while moving downward. The water pressure pushes your foot in an extended position. Straighten your knee at the end of the downward movement.
4) Now during the upward movement, the water pressure will straighten your leg and push your foot in a half-flexed position.
5) The propulsive phase of the kick occurs during the first half of the downbeat.
Flutter Kick Exercises – Instructions
The following drills can be used to learn the flutter kick. They are demonstrated in the video further below.
1) Hold onto the pool’s wall (or a pool lane marker). Push off the ground, and start to kick up and down alternately. Make sure your toes are pointed. Keep your head above water.
Feel how the kick pushes your legs and hips upward. Straighten your arms while holding onto the pool wall until your body is horizontal and fully extended.
2) Repeat the previous exercise but now put your head in the water, so it is in line with your body.
Try to get as horizontal as possible and feel how you can use a lighter kick to float. Stop kicking when you need to breathe.
3) Repeat the previous exercise but now try this: as your body gets horizontal, feel how you need to hold onto the pool wall less and less to support your body.
Try to become balanced up to the point where you only need to hold onto the wall with your fingertips. Then let go of the wall.
Keep kicking and feel how you are floating in perfect horizontal balance.
4) Push off the wall in a streamlined position: Your arms are extended forward, and your hands are on top of each other. Your head is aligned with your torso.
Try to be balanced, as you practiced in the previous exercises, and try to glide as far as possible, until the momentum stops.
5) Repeat the previous exercise, pushing off the wall and gliding in a streamlined, balanced position.
Start to flutter kick while gliding to maintain momentum.
Continue to kick and maintain balance until you need to breathe, then stop.
6) Grab a kickboard and hold it forward at arms’ length.
Assume the same horizontal position as before and use the kick for propulsion. Keep your head above water. Do short repeats.
7) Repeat the previous exercise, but now keep your head in the water, in line with your body.
To breathe, raise your head, then drop it back in the water. Exhale slowly in the water while kicking.
This exercise is easier for your legs because you are balanced, but harder on your lungs because breathing is restrained.
Flutter Kick Drills – Video
The following video demonstrates the kicking drills described above:
1) You can use a swim snorkel, such as the Finis Swimmer’s Snorkel, to make breathing easier while practicing.
2) The power in the kick comes from your hips, not from your knees. Your knees should only bend slightly during the downbeat. Think flutter kick, not bicycle kick!
3) If you have stiff ankles, it could be difficult for you to point your feet. If so, using swimming fins regularly can improve the flexibility of your ankles.
My preference goes to short fins like the Speedo Biofuse fins, because the kicking movements are more natural with these than when using longer fins.
4) If your hips and legs still drop while flutter kicking, it could be your upper body is positioned too high in the water.
Push your chest and head a bit down. Your body will act like a seesaw, causing your legs to rise.
5) If you still have trouble finding your balance in the water, a friend giving feedback and correcting your position can be helpful.