The Spanish right-back made his advance Gunners under former manager Arsene Wenger.
But Bellerin was criticized in recent years by experts who claimed that he had backed defensively under the Frenchman.
The new boss Emery has focused on reinforcements in the transfer window to improve the Gunners defensive line and midfield.
Stephan Lichtsteiner arrived with a free transfer from Juventus as a direct competition for the post of Bellerin.
Arsenal's high-performance director, Darren Burgess, recently revealed that Emery has made improving the defense a priority in the preseason.
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"We have seen that he wants us to be a team that, first of all, does not grant goals"
And Bellerin has now been registered as an advocate of the new methods employed by the former Paris boss St-Germain.
"I think the training has completely changed," Hector Bellerin said on Sunday's program.
"Arsene had different views on football that the new head coach has, so obviously it has changed.
"From the gym sessions we had before the training, to the sessions in the field and the race, everything has changed.
"Also the analysis and use of videos is different. All the Premier League coaches these days have a different way of looking at football and different ideas.
"A lot of people and people have changed and he wants to give himself the best opportunity for this team to be successful.
"We have seen that he wants us to be a team that, first of all, does not grant goals.
"I think that's something that has always been important for his team, whether he's been in PSG or Sevilla.
"You can see that their teams are very compact and compete for each ball and that is what has made it so successful.
"He has had a lot of success with teams that probably were not the best technically or did not have the best players, but they fought until the end and he is showing it to all the players, and that is how he wants us to be involved."
Arsenal expensive The defending champion of the Premier League Manchester City at the Emirates Stadium this afternoon (4pm).