Swimming Pool How should a warm-up?

The sea a few kilometers swim no problem, the recent re-pool swim twice, did not feel a headache a few hundred meters on the shortness of breath, vomiting feeling seems to be swimming halo. The first was finished a long car ride with me, I thought it was a long swim by car poor physical condition. The second time was 18:00 to go, no eat, I am out of the 500-meter jogging and then stretching a bit under the water, the result is still faint. I wonder if my physical reasons or my method wrong? How should a warm-up swimming?

I listened to a swim team classmates said they are all warm-up lap around the pond.

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Oh, the methods are incorrect啦
First of all, do not go for a swim hungry, not to run after the end Zaiqu swim

car is not going to swim, and so rested Zaiqu

another warm-up was confirmed when the

warm-up to avoid the cramps, muscle strain, etc.

specific warm-up method can refer to video

Video Address: www.tudou.com/programs/view/K7B1jolwVUE/

supplementary question:

sweating Of course not because of the water

sweat pores are open when the water

water could then easily be all right

but after a few years is likely to occur arthritis, rheumatism, etc.

Of course, just the words on the warm-up Also you will not sweat

run around the pond and then do some stretching exercise their own sense of almost OK on the