Learn to Swim - Basics of Buoyancy
blow bubbles in a steady stream, without any gap; the longer you can do that, the more breath control you have
practice: blow bubbles with your mouth
practice: blow bubbles with your nose
practice: bobbing = steady blow bubbles with your mouth and nose, then rise and take only one breath; repeat until it becomes natural
hold your breath, that's how you float, the air in your lungs provides buoyancy
stand in chest-deep water
hands in front, opened wide-ish, palms down
bended knees
get a deep breath then get your head under the water
kick gently to raise the feet and body up, paralel to the surface of the water
extend body, straight line
feet opened wide-ish
head straight, low between the hands, looking down, at the bottom of the pool
relax your muscles
float
as if "breaking waves with your chest under water"
start to dismount by bringing the knees towards your chest
pull your hands back, in a large sweeping motion
drive down and straighten your legs until you land to the bottom of the pool
as if "holding a jump"