Where is the greatest resistance?

Now I have a question: why, then, in freestyle, one should not have the head completely immersed in water, but keep the water level at about the hairline? Is it because it would be hard to turn to surface to breathe? So if one doesn't breathe, would it be faster to bury the head underwater? When doing head-up breaststroke, I feel I'm faster than the regular breaststroke (head popping up and down)--never timed, so I don't know, though I spend more strokes in head-up. Maybe it's just because I can see the scenes passing by? :rolleyes: Or maybe I wasn't swimming the regular breaststroke right (my feet tend to be out of water) :(

Now I have a question: why, then, in freestyle, one should not have the head completely immersed in water, but keep the water level at about the hairline? Is it because it would be hard to turn to surface to breathe? So if one doesn't breathe, would it be faster to bury the head underwater? When doing head-up breaststroke, I feel I'm faster than the regular breaststroke (head popping up and down)--never timed, so I don't know, though I spend more strokes in head-up. Maybe it's just because I can see the scenes passing by? :rolleyes: Or maybe I wasn't swimming the regular breaststroke right (my feet tend to be out of water) :(