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@Yan
This isn't related to cycling but last year I was testing for my second degree black belt.
A belly full of butterflies and paste on a winters morning, standing in a cold gymnasium hall. Water breaks were not permitted unless stated, so we all took in a reasonable amount. 3 hours into the testing and after numerous agonising methods of testing as well memory tests...I hit the 'wall'. My legs felt like jelly, my mind was blank and the dizziness was uncontrollable. I couldn't carry on my task. Seeing me in this state the instructor thankfully gave us all a waterbreak, not to single me out. At the first sip the room span out of control and I blacked out for about 3 seconds. After a fair amount orange juice and those energy bars, I was back on the mats and was awarded my second degree black belt the following week.
Metal prep is key with anything which calls on endurance.