Training at altitude from sea level

Hi Team,

I live in Florida at the beach and will be in Colorado the weekend of my 16 mile run. I’ll have a couple days prior to my run to acclimate. Any suggestions for doing my longest training run yet at nearly a mile of altitude?

I’m originally from Colorado but have been in Florida for 8 years and can definitely feel it when I go back and try to workout. Talk about thinking you’re in shape and getting put right in your place 🤣

Thanks!

Rita