I really enjoy swimming! i am especially fast swimming backwards
Ah the self propulsion of a person through water
yup! do you like swimming ? most people i talk to all enjoy it
Yes I swim for recreation or exercise some others swim competitively or for sport or even survival 
oh you swimmed competitively too? I also did this! i enjoyed it so much and i won the race   
No I swim because its low impact and easier than other forms of exercise like running
yeah but did you know you actually exert more energy? crazy, you actually physically get more tired but you just don't realise it until the next day
I think its because the human body is less dense than water so water supports the body weight ie we don't get tired