The France international struggled during his first season at the Emirates Stadium and was in and out of the team, but feels more settled after an impressive second year.
Speaking to Arsenal Player, the former Lorient man said of his improvement: "I was in the gym more, that is the first reason.
"I feel better than last year. I know the league, my team and the club. I think I am better on and off the pitch so for a player, when you feel good with your team-mates, the club and his family, it is better.
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"I feel very good to help my team and to qualify for the Champions League. I just wanted that for the end of this season.
"I know this league more than last year. In all my body I am better, not just physically, psychologically as well.
"It's great for me, I work hard in training to be strong and the results have been in my game. I try to be strong and be the best defender I can in my team."
The defender also spoke about his favourite moments in an Arsenal shirt, but one match stands out the most for the 26-year-old.
"I have a lot of best moments but maybe against Tottenham [on February 26 was the best] because we were losing 2-0 after 25 minutes and came back to win," he opined.
"It was the derby so the atmosphere was amazing. The fans were amazing and it was a very good game for every player and everybody who watched this game."