Which has a higher altitude?

so i run and i think that running in higher altitudes makes you a better runner cause the air is thinner and it will make me work harder and when i go back to lower altitude it will be easier to run in. so i am wondering which place has a higher altitude: kalamazoo, Michigan. or China. i am going to china this summer and i want it to have a higher altitude so i can be a better runner. the places in china i am going to are: beijing, shanghai, fuzhou, and hong kong. thanks for your input, this means a lot.