Letter J
Maybe information on significant JOINTS utilised in cycling.
JUMPS, in breakaways and sprinting.
Specific training for JUNIORS.
Letter K
Training for the KILO rider.
KOPS (knee over pedal spindle) for rider positioning.
Letter Q
Only think of the word QUADRACEPS
Letter X
No idea, maybe X training.
Letter Z
No clue really. The only word that comes to mind, ZINC for recovery.
Good luck with your project.
Dave.