The 28-year old admits he isn't a huge fan of pre-season training but said it's great to get back to the club and begin preparing for next season, which kicks off on July 23.
"It's good to get back into it because you want to get your fitness levels up so you can look forward to the games again," he told the club's official website.
"I've missed it, but to be honest, it's only been four weeks so it's not really much of a break.
"I think it was just long enough, though, because any longer than that and it would have started feeling strange without it.
"Everyone dreads pre-season, except the few, like Cha (Du-Ri), who actually enjoy it. He's an exceptional runner so it's easy for him.
"But I'm always wary of the first day because it's usually very hard.
"It was tough going today but that's just to see where you are really. I felt good, though, so it's a good sign."