Will I ever have the courage to join?

Went to get a glimpse of the ultra-human sweating for the ultra event, Penang International 12 hour walk. The race involves walkers covering as many laps in 12 hours, from 8pm to 8am, with each lap measuring 1,078 metres. Haven’t figure out how did they fight the sleepiness, how did they stand the extreme fatigue, how did they continue to walk with sore leg and muscle cramp and most importantly how did they fight mental war within them. When I figure these out, next to figure out will be the 50K ultra marathon, then 24 hours walk, then dualthlon, then powerman triathlon and ultimately the ironman (3.86km swim, 180.2km bike and 42.195 km run).