"Clinch was a major issue in Indian boxing. We were not used to making the time in clinches count. It was random and poorly executed mostly. Now, I can say the scoring rate in clinches is 70-80 per cent better. The idea is not to stagnate," he explained.
"Also, lack of strength in close range boxing, that was an issue. For example, Amit is a fantastic long range boxer and we have made sure that he improved in close range as well. He is not the tallest boxer in his category, so he had to be better in close range boxing," he said.
Apart from this, Nieva said Indian boxers will step inside the ring in Tokyo with a better control over their minds.
"I am confident that it will be a stronger performance. They have to take control of the centre of the ring. They cannot evade that and expect to win. They have to control the pace, ease up a bit when in lead. The disbalance problem is also sorted now.
"They have to think quickly and adapt quickly to any situation without looking at the corner for tactical guidance. We have worked on all these aspects," he elaborated.
And what about the uncontrollables, like the COVID-19 threat, which is looming heavily over the Games?
"We are dealing with it for over a year now. It is not coming as a shock to anyone anymore. We have kept ourselves in a good state of mind and made the health safety protocols a habit," he said.
With the Olympics, starting July 23, it is the completion of a cycle for Nieva and women's High Performance Director Raffaele Bergamasco, both of whom joined in quick succession.
"It has been an amazing ride. I was made to feel welcome from the very first day. My suggestions and inputs were taken in good spirit and I found it very easy to work in India. I can say I have been fortunate to work in the country," he said.
"I am also aware that nobody will like any of what I did if there is no medal in Tokyo and I am confident that we will meet the expectations of medals. But even otherwise, we have done our job to the best we could," he added.
Being an Argentina-born, football is Nieva's other passion and he recently drew happiness from Lionel Messi finally getting his hands on an international trophy -- the Copa America.
"Hopefully we can also do something great in Tokyo. I mean, watching Messi lifting Copa was so much happiness. He deserved it because he had worked so hard. Nobody deserved it more than him," he said.