R.J.
I'm one of those former swimteam/lifeguard/military rescue swimmers/swim every day kind of people. We also home school. And while I've taken my son in the water with me every chance I've had... we signed up for swim lessons starting at age 2.
For US, it has been invaluable.
1) Having a teacher (k, series of teachers) that teaches swimming in a different way then I would. Not better/worse... just different.
2) Having other kids who are at the same level
- to make the "scared/excited" face at & with "X" activity
- to have fun with
- to know that "x" is "safe" because they're watching other kids do the same thing
- to have a chance to REST between one-on-one time
3) Having kids who are at higher and lower levels
- to watch
CAN you teach your son to swim? Of course. Swim lessons are fun (if they're not you're in the wrong program), but not necessary.
PS.
Floating isn't usually the first thing taught to children, although it is one of the first things taught to adults. It's usually comfort in the water, safety, trust, then things like swimming & floating. Floating is actually one of the harder things to teach. It requires trust and relaxation. Any tensing of the muscles and they sink like a stone. A LOT of early swim lesson time is spent teaching kids to be horizontal instead of vertical. here's a short list of early child swimming. :)
- sitting/standing/playing in the water (comfort, usually done on the stairs)
- monkey walking along the wall
- relaxing while being held/carried through water by adult
- blowing bubbles
- face in the water
- holding your breath
- kicking while being held
- kicking while holding on to the wall
- Pushing off from the stairs
- Pushing off from the wall
- Going under (bobs, not swimming)
- Jumping off the wall to instructor
- Gliding (to instructor from the wall/stairs)
- Gliding (from instructor to wall/stairs)
- Face in the water while kicking
- Kicking with a kickboard (face out)
- Kicking with a kickboard (face in)
- Arm motions
- Arms and kicking while being held
- Back float while being held
- Going under to grab something from the bottom
- "Swimming" to instructor (about 5 feet) from stairs/wall
- "Swimming"/gliding from instructor from wall
- Jumping off wall and getting self back to surface and back to the wall
- Backfloat by self
- Swimming by self with instructor walking alongside (5, 10, 15, 30 feet stretches)
Anyhow...that's just a short list. In general, that's mostly what's taught over the course of 6 months (or 2 summers). Some kids get all of that much faster and master all of that in a month, others take several years before they've achieved that degree. But in general, it takes about 6 months.
ALSO, don't try for longer then about 30 minutes in the water at first...with about 10-15 minutes of your son using his muscles. Expect him to be shaking-tired. The length of time gradually gets extended as muscles/endurance builds up. They also recover fast. So shaking tired after a half hour lesson in a real pool is frequently followed by 2 hours in a splash pool.