quake in one's boots
to be afraid, to shake from fear
I was quaking in my boots when my boss told me to come to his office.
Rules to play Olympic Decathlon
The score matters most
Decathletes are actually competing against a scoring table not each other directly. At the end of all events, the athlete with the highest score wins. So a good decathlete must score well in each event rather than just dominating a few (easier said than done, of course).