Floating on your back in a horizontal position, kick your legs up and down. Keep your legs straight, but not entirely rigid. Your toes should be pointed out. Try not to make a big splash with your kick; just churn the surface of the water.
Pivoting slightly at the waist and rotating your shoulders, windmill your arms. Keep one arm straight as you raise it out of the water from your waist to a fully extended position. At the same time, the other arm should be bent and pulling a cupped hand along your side in the water, from the extended position back down to your side. Your hand should enter the water pinky-first.
Keep your head floating back in the water, with your eyes looking up. Breathe normally.