Rabbitohs centre James Roberts.

James Roberts was beginning to take it personally before South Sydney snapped their four-game losing streak against the Sea Eagles last weekend.

The former NSW centre enjoyed his first win in the cardinal and myrtle since 2011 after having re-joining the Bunnies from the Broncos in June.

Happiness is the key to most aspects in life and Roberts is back in his happy place with one eye on making a big impact in the Rabbitohs' run to the finals and their premiership push.

"I feel refreshed mentally and physically, I'm loving going to training and really enjoying my footy," Roberts said.

"It's like any job really, if anyone is happy with what they're doing you get the best out of them. I think that's the key factor in life.

"You don't see too many successful unhappy people so I think happiness is the key and that's what I went with.

"I'm really enjoying life at the moment and footy. My family is down here now and settling in so it's all falling into place.

"I'm still getting to know a few of the boys I don't know and getting the combinations right."

Roberts said the Achilles injury that hampered his performance in the first half of the season at the Broncos still lingered but a recent weight loss at Redfern had helped him regain speed and agility.

"It's not all clear but it feels a lot better," Roberts said. "I've trimmed down a lot, lost about four kilos so that's helped my ankle and the tendon.

"They didn't really come and say anything but I knew I felt a bit heavy. Speed is my asset and I didn't need to be too heavy.

"I'm doing a lot of extras but I've still got a bit to go. Wayne [Bennett] looks after me a bit and gets you ready for the game."

Roberts has already expressed a motivation to be back in NSW colours next season after a disruptive 12 months saw him fall out of Origin contention.

Before that, he will focus on the Rabbitohs' pursuit of a 22nd premiership win.

"You want to play at the best level you can and for me, Origin is a great asset," he said.

"Premierships are a lifetime goal so that's the main goal. They come when the team works hard and plays well."