I just rode a brutal harescramble yesterday. I have been training on my bicycle for two months for this event. My heart/lungs were fine. What really crippled me was I got very serious arm pump almost immediatley. When the arm pump went away it was replaced with cramping and severe fatigue. So bad that it affected my ability to control the machine. I considered stopping the race because I was questioning my ability to safetly manuver the bike over the very challenging terain. Obviously my preperation was not adequate. What to do to address arm pump/arm strength/arm endurance?