Horsetooth 10K-Swimming at Altitude
I'm thinking about celebrating my 70th birthday with the Horsetooth 10K in 2020. I've done well at sea level (Boston Light, Potomac River Swim, Lido Key and others), my question is if I show up Friday evening and swim Sunday at the Horsetooth event, how big a challenge will the altitude present considering I'll have virtually no aclimization? Any other flatlanders out there swim Horsetooth? Any lessons to pass on?