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You can also correct your posture. Racehorses try to run  dpdp2218@gamil.com with their heads up, but if you are teaching on a hillside, you naturally put your head down and run. Also, it is very important to be a hillside, such as enabling interval teaching.  dpdp2218@gamil.com Thank you for telling me a lot about the importance of the dpdp2218@gamil.com  hillside. In the future, Pukyong will also introduce a hillside. However, it takes time to make it. As far as I know, I have said in the past that a treadmill can create the effect of a hillside, but dpdp2218@gamil.com  how can I use a treadmill to create an effect similar to a hillside? A hillside is usually made with a slope  dpdp2218@gamil.com of 4%, but if you use a treadmill, you can run the racehorse at 10%.