HI! I'm new at this forum, and I would like to ask you a doubt about players. Why do I have young players of 18-19 that when they train doesn't progress the same or even more that players of 20-21 years? For example, last training, a player of 18 progressed 18% and other of 20 progressed 53%, in the same conditions of training, same intensity and training.

Thanks in advance, and good luck in matches!