Which is a better method: the single- or double-arm drive in the triple jump?
This is a common question asked by many coaches and athletes when learning to triple jump. The answer comes down to what is most effective for each individual. People have jumped very far using different styles, so there is no universal method.
THE FIRST PHASE: ARM DRIVE THROUGH THE BOARD
Going into the first phase (the hop), most of the world's best jumpers use a single-arm running motion as they pass over the takeoff board, much like a sprinter. A single-arm motion is conducive for conserving speed.
By contrast, when setting up a double-arm action there is a tendency to gather the arms during the last few steps of the approach -- disturbing the running motion. Instead of attacking the board, many jumpers coast into it as they gather.
Since it is a rare jumper who can sprint through a double-arm preparation without slowing down, the single-arm style seems the best way to go for most jumpers.
ARM DRIVE ON THE SECON...
