1. I think that doping should be punished more because the substance is considered a willingness to exploit others.
2. Current may have used stimulants that can not be detected in various sports events.
3. The future development of sports science even more. We humans may be able to run 100 meters faster than 9.4 seconds, it is not.
4. The distance runners have strong lungs over the short run.
5. Foods that are considered critical to a runner can run well.
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