Altitude training?

It's been too hot around my place, so we went far to cool off. We trekked around mountain areas and went up to the peak of 1,700 m (about 5,700 ft) above sea level. It sounds a very high peak, but you can get to almost 1,400 m level by car and the trails to the peak are well-maintained so that you can reach there much more easily than you're afraid. I raced my older daughter, who belongs to a track team in her junior high school, and reached the top almost at the same time. Other two members of my family struggled and arrived much later.