Linear speed. Otherwise known as "straight ahead" speed.
It's the one athletic trait that's easy for anyone to see.
Think of Usain Bolt sling-shotting through the turn in the 200m.
Sergei Federov exploding from one end of the rink to the other to score a breakaway goal.
Bo Jackson bursting through the line and accelerating past hapless defenders.
Mia Hamm sprinting to a loose ball sending a rocket kick into the top corner.
Simply put. Speed is king. The more an athlete has – the higher their athletic ceiling becomes.