It's clear that this American nordic skier is super fit, and on a roll. Sierra-Zinal is possibly the most competitive mountain trail race, outside of the UTMB races. Now that she is leading the Golden Trail Series, how will this impact her nordic World Cup season? Will she be tired and rusty for Period I races? Will she skip some of those races to recharge, and do a solid training block? Is she pointing towards the Tour de Ski like last year?
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