Fielding should be a passion. It has to come from inside. Today Azhar is doing so well at this age, he wants to excel and perform. The fielder has to have the inner feeling that if the ball gets past me within a reasonable distance it is an insult. Training is good to a certain stage only.
Physical training is a different aspect though.
Ultimately it is the individual who takes the catches, reflex or instinctive catches. It was the last ball of the day, Walters was on 103. Walters edged it, Faroukh went for it, it went through him. I took the catch behind Faroukh diving to my left, it was very satisfying. For example it is said that the front foot no ball rule gives the umpire much less reaction time to take a decision.