Why are we weightless in water? i.e. swimming pool?
467277
we are not weightless...\nthe air inside of our lungs allow us to float..\n\ntry this..\ngo underwater and blow-out all of the air in your lungs..\nthen you will feel yourself sinking to the bottom..\n\n.. that's how boats float even if they are so heavy..\n\ngodspeed
429917
A lot more than most exercise. Swimming requires you to be able to balance yourself in a certain position while in the water. In order to balance your body utilizes a lot of small, core muscles in your midsection to keep balanced. Other than these small muscles, your forward propulsion is generated from your upper body and your legs also help with balance and propulsion. In other words, your whole body.
1153754
I used to be a competitive swimmer, and during some training sessions we had to wear multiple layers. They essentially create "drag" which increases resistance. Weight is offset by buoyancy, so to increase the resistance in water, you add clothes. Sweatpants/shirts absorb a lot of water, thus add a fair amount of resistance to a work out. While I'll admit, I haven't seen the aquacise classes apply this technique, it does come from sound water based training principles.
489437
What do you weigh at the center of the earth? Zero, because the mass of the earth is pulling you equally in every direction.\n\nYour weight is greatest at sea level. Of course your weight decreases as you go to Mt. Everest, because you are now at a greater distance from the center. \n\nBut as you go down, your weight decreases for a different reason. Now there is mass of the earth above you pulling on you in an upward direction. That is why you weigh zero by the time you get to the center. \n\nIf you are on the surface of the earth or above, the earth's gravity acts as though it is concentrated at a point at the center of the earth. When you are INSIDE the earth, as in Death Valley, earth's gravity no longer acts that way.
1054074
You float without weight there.
157120
This goes along with the question of why don't we fall off the earth if it is round. The answer is because gravity is holding us (and the water) down.
608366
Just swimming will never make you "slim".  You may loss some weight in the beginning but you will never become totally tone.  If you look at a lot of swimmers, they are bigger builds, broad shoulders and such.  Any exercise needs to be supplemented with healthy eating habits.
1130799
what is incredible about swimming is that it is horizontal exercise,and like flying in mid-air! For some people it might be the only horizontal exercise they ever get.. Because you are in the water you are able to move more weight with less resistance,and exercise your cardio-vascular system ( if you progress into laps,especially) A great body workout!!
853429
Swimming is a great way to lose fat... It's Possibly the best way to get ripped without stepping into a gym.
246088
ja :)..all objects with mass experience gravitational forces; about it's effects I don't know many, but the varicous veins for example are due to gravity in a way:blood doesn't flow up easily and gets stuck in his way and those are formed; also astronautes experience space motion sickness, when they are out the earth ( headache , nausea and even vomiting..yucky)...that's because our vestibular system is govern by the motion of liquid ,and when there is no gravity it originates changes.\nif you mean: humans ¨excert¨ gravitational forces by your question..I would say due to our little mass compared to the earth it means nothing (..unless you are really really fat! :P)
1051142
because water molecules are heavier than air molecules.  If you think about it, these heavy molecules are weighing down (even though they are suspended) on everything around them  with more force (which is proportional to the mass).
1046580
You might be gaining weight through your fat turning into muscle, which weighs more.\n\nI'd stop doing any weights in the gym, and do more cardiovascular work. If you get a bad back stick to more swimming- I'd go everyday if possible.
987103
Swimming IS actually proven make people "stretch"... If you constantly swim, and I mean with the correct strokes, swimming laps, etc. you stretch the muscles, ligaments, and tendons, which then pulls the bones and lengthens the body. If you are a swimmer, you'll know, I do. Oh, and if you're still sceptic, look at all the swimmers of the 2004 olympic games. it's not coinsidence that they are all taller than 6'2". I mean everyone in my family are surfers and, spear fishers (both require great swimming ability) and we're all skinny and tall. kinda lanky too but swimming doesn't really BUILD muscle just slims you down, a lot
96757
SWIM SWIM SWIM. The best excercise in the world. Swimming is totally weightless and it works a series of ways. It is Aerobic and resistance training in one. Aerobic works to get your heart rate going and thus will increase metabolism and help circulation which all burn fat. Also if you are swimming and not doing a stationary type of water work out then your breathing becomes regulated by the type of stroke you are swimming. Resistance training is from the water friction. Every step and stroke you make is like having a few pounds on your hand. Resistance and light weight training is important when losing weight because you have to tighten the skin as well. Good luck, it will change your life when you lose the weight, but make sure you do it right.
868202
I float in a fresh water pool, don't you?  My head is not above water, but if my lungs are full of air I do not sink.  If I empty my lungs then I will sink.  What is your question?
372889
Every body that is in a fluid, or it is floating on the surface, or is sunk to the bottom loses an equal ammount of weight as the weight of the displaced fluid by the volume of the body.\n\nThe force that makes body's float or makes them lighter in a fluid (for ex. water) is called Archimed's force or Archimed's principle.\nIf this force is grater then the weight of the body (G=m*g) then the body floats on the surface.\n\nArchimed's force is greater if the density of the fluid is bigger. Oil has the density of 900 g/cm3 and water has the density of 1000 g/cm3. Because the reason why the objects are floating in oil and in water is of same nature, floating on oil is similar to floating on water.\nBut water has a bigger push force then oil.
316347
Swimming is a technique to move unaided through water. This article concentrates on human swimming, a popular recreational activity and a competitive sport. There are many health benefits of swimming, but it also entails risks.\n\nSwimming has been known since prehistoric times. Drawings from the stone age were found in "the cave of swimmers" near Wadi Sora (or Sura) in the southwestern part of Egypt. Written references date back up to 2000 B.C., including Gilgamesh, the Iliad, the Odyssey, the Bible (Ezekiel 47:5, Acts 27:42, Isaiah 25:11), Beowulf, and other sagas. In 1538 Nicolas Wynman, German professor of languages, wrote the first swimming book "Colymbetes". Competitive swimming in Europe started around 1800, mostly using breaststroke. The front crawl, then called the trudgen was introduced in 1873 by John Arthur Trudgen, copying it from Native Americans.\n\nSwimming was part of the first modern Olympic games in 1896 in Athens. In 1902 the trudgen was improved by Richard Cavill, using the flutter kick. In 1908, the world swimming association Federation Internationale de Natation (FINA) was formed. Butterfly was first a variant of Breaststroke, until it was accepted as a separate style in 1952.\n\nTechnique\nThe human body is composed primarily of water, and thus has a very similar density. But since only roughly 70% of the body is water, it is slightly less dense than the surrounding water, which exerts a buoyant force on it. Thus, staying afloat requires only a slight propelling of water downward relative to the body, and transverse motion only a slight propelling of water in a direction opposite to the direction of intended motion, due to generally low hydrodynamic drag. This propelling is typically accomplished by cupping the hands and using them as paddles, and by kicking the legs to push water away from the body.\n\nWith practice, technique can convert a slow or average swimmer to at least a moderately fast swimmer. Since speed converts directly into distance, the same techniques that improve speed also aid one to move farther with the same effort. The torso and the legs should be kept as much as possible parallel to the surface of the water. Dropped legs or a slanted torso dramatically increase drag. The hand should be extended forward of the head as much as possible. This increases the average length at the water-line, substantially increasing speed. This is an effect long used by boat designers, and unconsciously used by "naturally good swimmers."\n\nThe time spent on the side should be maximized because the torso is narrower front-to-back than side-to-side on most swimmers. This reduces the frontal cross-section, reducing drag further, and also increasing the ratio between the body's water-line-length and width. Similar improvements are possible by orienting the narrowest direction of head, hands, legs and arms into the water. The torso is by far the most critical. The motion of the hand, arm, and leg from the back to the front should be in the air for as much as possible, and in the water, oriented as perfectly as possible, because the returning appendage has to move at least twice as fast as the swimmer, and in the water generates eight times the drag (which increases with the cube of the speed) of an equal amount of torso frontal area.\n\nThe basic "catch" of the water is not nearly as critical as the above items. Most swimmers simply grab water with their hand flat, or the fingers slightly spread, and then draw it smoothly down their body. None of the above techniques require improved strength. With strength training, the hands and feet can be extended further into the water, gaining more propulsion. For beginners, increased strength brings only small improvements if the above strategies (minimising drag and lengthening water-line) are not optimal. A number of swimming styles have been developed based on the implementation of some or all of these principles.