We joined Parker Stinson for a "big boy" Half Marathon specific workout at his training base in Boulder, Colorado on May 9th 2021.
The session: 1km hard, 5km tempo, 1km hard, 5km tempo, 1km hard with 3min recovery between all.

Boulder sits at an elevation of around 1600m (5300ft) which for an athlete completely acclimatised to the altitude, will convert to around 34sec per kilometre (or 56sec per mile) slower than training at sea level.

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Parker Stinson Instagram:   / _parker_stinson_  

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