Coolsaet GO is a Personal Run Coach service owned and operated by Canadian Olympian Reid Coolsaet.
Coolsaet GO offers coaching from Reid Coolsaet, Krista Duchene, Jordan Bierema, Dave Stevens
and Jeffrey Stern.


Jeffrey Stern

Jeffrey is a former pro mountain biker that has been coaching athletes of all kinds since 2015. His second mountain bike race ever was the Leadville 100 and since 2017, he has completed nearly 30 ultras ranging in distance from 50k to 100-miles. He also enjoys sub-ultra trail races and has completed North America’s oldest trail race, the Dipsea, 15 consecutive years now. Recent racing highlights include a win at the 2024 Mountain Mist 50k in Alabama, 3rd at the 2023 Kauai 50-miler, 3rd at the 2023 Quebec Mega Trail 25k, 7th at the 2023 Chuckanut 50k in Washington, and 2nd at the 2022 Big Sur Marathon. Jeffrey lives just north of San Francisco in Mill Valley, California, and brings a wide breadth of training knowledge and racing experience to the Coolsaet GO coaching team.