Well depends on what year it is but in the early ages it was for land, might need more details though
Answer:
T
Explanation:
The t is silent when you say listen you don't hear the t
Answer:
totter~move in a feeble or unsteady way.
trickle~(of a liquid) flow in a small stream.
Explanation:
Because since the athlete likes it and enjoys it, others will too. Knowing that it works for a pro, it will of course work for normal citizens