Force India's Paul di Resta admits he is under pressure to perform in 2013

Paul di Resta admits the pressure is on him this year as he prepares for his third year in Formula 1 but says he is fitter than ever.

Di Resta says he has been training hard for the new season and has even joined in Jenson Button's bike rides around the streets of Monte Carlo. "Monaco is my home, and essentially I've made a lot of good friends down there, with Jenson part of a group in which we all get on well - it's nice we can go out and train together," said di Resta. "We'll still have that competitiveness at the track, but it's good we have developed a friendship where we can go out and knock ideas off, and even talk about our personal lives. "I'm sure at the track we'll probably train together a little this year, and he is very fit. "He obviously has this desire to do triathlons, whereas I can't run. I can't really take it. "I do different things. I mix it up - swimming, rowing, cycling, weights - because you can get very bored and get out of the zone. "I'm now seeing the difference. In January I trained on 27 of the 31 days. I have definitely lifted it another level, which is good."