Alpine Granfondos here in Europe are usually ~180 km / 4000+ m races, with 3+ big climbs (1+ hrs). The first part of the race is always crazy fast, with high speeds and power bursts on every corner, every 2-3 minutes to keep the pace of the lead group.
Last year I did 6 weeks Climbing Intervals TP + 6 weeks Fondo TP to prepare my “A” event.
I was quite confident on my climbing, but the race day I was unprepared for so many hi-power bursts. The result: at the top of the first climb I was already cramping hard - and my race was more or less over.
What is your advice? How to include intermittent sprinting into endurance plans?