So, what has prompted the turnaround in form?
"I'm injury-free, that's a big start and I'm really, really fit. I've done a lot of work with our trainer Greg Owen and Jordan Drinkall, his assistant. I've been doing a lot of CrossFit to try to get more explosive and really work on the power side of things."
As for the food options, McClenaghan has given up bread and pasta.
"The diet's been massive as well. No sugars, no breads, no nothing, really. Just good veges and broccoli, lots of broccoli. I've learned to love it."
McClenaghan was selected for the New Zealand A side who played against the touring Indians in September and took 3-42 in one of the 50-over outings, which shows he is in the wider frame for the Black Caps.
McClenaghan might expect to be given a chance at some point, given the national side's struggles across all forms of the game recently, but he admitted the selection process was a fickle beast.
"I reckon consistency is interesting when it comes to bowling because you can bowl incredibly well and not get wickets," he said. "For me, if it's coming out well even if I don't get wickets, I'm not too bothered. I guess if the selectors are going to pick you, you have to be taking wickets but I'm just worried about myself at the moment and trying to make sure everything's coming out well at my end."
It's certainly been coming out quickly and Lou Vincent tweeted after a recent first-class game that McClenaghan should be in the New Zealand side to meet England when they tour here in February and March.
"I wouldn't go that far," McClenaghan smiled. "But Lou's great with the press, isn't he?"
Auckland's next Plunket Shield outing begins on Monday when they host Wellington at Eden Park and, if McClenaghan continues to steam in and bowl well, a meeting with England in the New Year isn't out of the question.