The France defender puts much of his improvement down to hard work off the pitch.
"I was in the gym more, that is the first reason [I have been stronger]!" he told Arsenal Player.
"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. 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."