Good physical and sometimes the time difference

I have physical problems such as the time difference is sometimes good and what is the reason? For example, I once jogging more than 1,000 meters (a half-way there is a break to drink water) than I felt the first time at athletic meets to run 400 meters is also easy (when I was running feet approaching the soft end of the time more of the 1,000-meter run the more the spirit of 400 m finish in the 1,000 meters after a few weeks) and sometimes play basketball, run laps back and forth is true and sometimes tired, sometimes the ball does not go without a few minutes to physical fatigue expert Zhijiao In addition, I sometimes afraid of the cold body every day, always will be sweating (even if there is air-conditioned low temperature) has linked 14-year-old body slim Mody I help! Brother did not just create a resolution of sub-please enthusiasts help solve the problem Thanks again!

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group of children, young nice, actually, you can be 1-3 times a week jogging exercise, each preferably in the range 1600-3000M, half-way must not walk for a month, you will find physical strength improved rapidly.

In addition, the exercise replenishment must be in the sports or exercise for half an hour before the beginning of the end of 40 minutes, half-way you can drink a little, but keep in mind can not be too bad on the heart.

In fact, this is the performance of the body acid-base imbalance, want to improve, if only exercising attention to nutrition.