Hey ya'll!

I live at sea-level and this summer I want to backpack in Rocky Mt. Nat'l Park. I would really like to do a 5-day backpacking trip and I am wondering how I should prepare for that in my low elevation home.

I will be going up about 8 days early so should I be hiking or can I just do an evening exercise routine?

Will we need more time than that to get acclimated enough for such a long trip?

Perhaps I can just take the first day of the trip slow as well?

Any advice would be great!