Extended data
The standard playground circle is 400 meters. But 400 meters is the length of the inner ring, and the length of other outer ring lanes is inconsistent. The second ring is 407.04m, the third ring is 414.70m, the fourth ring is 422.37m, the fifth ring is 430.03m, the sixth ring is 437.70m, the seventh ring is 445.37m and the eighth ring is 453.03m..
The standard playground is a semi-circular 400-meter runway. When the internal bending radius is 36m, the two bending lengths are 228.08m, the two straight bending lengths are 17 1.92m, the internal bending radius is 37.898m, the two bending lengths are 240m and the two straight bending lengths are 160m.
A standard track and field usually has 8 ~ 10 lanes, and each lane is 1.22 m ~ 1.25 m wide. There are two circular runways consisting of two bends and two straights and different competition areas.
The playground is mainly used for sports training, sports activities and sports competitions. This is a track and field venue.
Since the standard playground is 400 meters, what about the length of the non-standard playground? Non-standard playground should adjust the straight line length to make the radius an integer, and the circumference of a circle should be 200m, 250m, 300m, 350m, etc. Generally speaking, the venues for holding large-scale sports clubs and playgrounds in colleges and universities are around 400m, while many primary schools and kindergartens use nonstandard venues, because the activity area of children is far less than that of teenagers.
The 400-meter standard playground is more convenient to organize various competitions. For example, the 100-meter sprint only needs to be carried out on one side of the straight, the 200m sprint is half the distance of the playground, the 400m sprint is a circle, and the 800m sprint is two circles, which is conducive to delineating the starting line and the finishing line.
Four principles of running
1, make full warm-up preparations before running.
2. The key to healthy weight loss lies in the time and speed of running.
3. Correct running posture
4. Stretch after running.