The mercury had reached 30 degrees by 10am at Visy Park, but it didn't stop Carlton's finest from slogging it out hard on the oval under a ruthless sun.

Today marked day two of pre-season training in 2015, and Carlton's Director of Training & Development, Rob Wiley, said that the boys have returned from the break ready to work hard.

"They (the players) came back with renewed enthusiasm," said Wiley.

"During their pre-Christmas training, they had set (themselves) really high standards. They'd tackled all the challenges that were thrown at them…the testing that we did yesterday had very pleasing results."

Wiley says that across the board all players have begun the new year on a high, having displayed exceptional levels of fitness.

The good thing is, from probably our oldest player down to our youngest player, all have shown excellent standards," Wiley said.

Carlton midfielder Chris Judd is enjoying an impressive pre-season. (Photo: Carlton Football Club)

"Chris Judd, before he went on his overseas trip, was burning the track like he was a 20-year-old. And then you have someone like Patty Cripps, who after one year (of being drafted) has dropped a bit of weight and has gotten fitter.

"So right across the board, we have everyone that wants to make sure that 2015 is going to be much better."

With just over six weeks until the AFL NAB Challenge kicks off, Wiley says the players will be subjected to a range of high-intensity training, in the lead-up to the Club's pre-season camp at Mount Buller.

"We've got to be smart," said Wiley.

"They've come back off that two week break, so we're not going to be jumping straight into the deep-end, we've got to slowly build them up.

"But within a week or so, we'll be back to high-intense training. We've got out football camp at (Mount) Buller at the end of January – so we'll build up to that.

"We're probably only five or so weeks away from a game, so it's a matter of getting the players ready for that.

"The group is in very good condition compared to the amount of operations and modified training that we had the year before."