why do humans swim when they are not built for it?
142017
as a form of recreation and also to prevent drowning should they fall into deep water.
511245
Swimming is the best sport for the human body.  You have to use so many different muscles, and, if you are swimming properly with the correct form, your using more muscles than any other major sport.
71599
Well... as far as biology goes... no.  They don't need air... just oxygen.\n\nIf our bodies were capable of breathing in water to extract oxygen we'd do it... unfortunately, we cannot handle liquid in our lungs, hence the drowning bit.  We do get better gas transfer from water... however our bodies cannot generate the force to expell the liquid under normal breathing conditions.
205693
Yes, because when dead people are in water their bodies swell causing them to float to the surface. Then they are free to attack anyone on the surface. If you pop them though, man, look out.
351401
Well-trained athletes CAN pump more blood from their hearts at maximal exercise, but the main reason they tend to have slower heart rates is because their muscles are much more efficient when it comes to extracting oxygen from their blood.  Therefore, for the same amount of work that their muscles are doing, not as much blood flow is needed to supply the necessary amount of oxygen.  Therefore, their hearts don't need to pump as fast or as hard to keep the muscles well-supplied with oxygen.\n\nThink of it as two people standing on a riverbank.  One guy (the non-athletic heart) is using a crappy fishnet and can only catch 10% of the fish that swim by.  If he needs 10 fish an hour to survive, he needs to have 100 fish swim by to in an hour.  If the guy next to him (the athletic heart) has a brand new fishnet that can catch 50% of the fish that swim by and HE needs 10 fish an hour to survive as well, he can do just fine with only 20 fish swimming by every hour.  Does that make sense?
61684
Swimming is a better total body workout. By varying your swim workout with drills, you can get an equally strenous lower body work out swimming as you can in a spinning class. Swimming is an excellent workout for your core muscles and smaller muscles that lifting alone would be difficult to work.
516744
Some are so small and weightless that they can actually walk on water. Others can make an air bubble and submerge themselves under water with that bubble to breathe in order to get food.\nIt's amazing what the Discovery Channel can teach you.
1050208
No...They have a stand in swimmer.
1125523
most people dont do it, unless they catch and release a fish in hopes to catch a bigger one
412591
people think it's a wimpy sport. when it really isnt. it's actually much harder than the "tough" sports, like basketball and football. both mentally and physically.\nand on the men side. most men look at men swimming, and think yuck, they have to wear speedos! but i'd like to see them jump in and swim 10,000 yards! everybody can run. hardly anybody can swim!
120972
The water in this planet can support all of it inhabitant but places like desert have difficulties in getting enough water. We need water because we use water as a medium to cool down.
1122428
Because the body cannot process salt water.
192456
Yeah this is a valid concern.  I've seen a number of kids who grew into very talented swimmers in college who had great difficulty keeping it together because their bodies had been so abused over time.  Bad shoulder joints and tendons...etc.
332818
Because they can swim and know how to play team ball.
882417
Swimming is much better than running because it is low impact where as running is very high impact. \n\nSwimming is a valuable activity for physical therapy and exercise. Because it works the majority of the muscles in the body and provides both aerobic benefits and resistance benefits (as the swimmer pulls and pushes through the water), the sport is generally considered one of the most complete forms of exercise. Swimming does not strain joints and connective tissue as much as many other forms of exercise, and swimmers injure themselves at a lower rate than most other athletes. Athletes in other sports who are recovering from injuries often swim to stay in shape.
586936
once they grow up, they can appreciate how wonderful swimming is.  it is like the most beneficial sport and works out the whole body.  if u care about health and good looks, swimming is perfect.  it combines strength, endurance, and ryhthm and not just any dumb jock weighing in at 200lbs can be good at.  its takes a lot of practice to be good at it.  and we are the ones that can actually show off our body and they are just jealous cuz they cant look this good in speedos.
303482
Because you can swim and you can fish but if you catch a swim, you would have to fish with flippers on.  If this doesn't make sense, I blame it on the beer.