Boyle has been working out with Fred Vergnoux and his group of Spanish swimmers.
There's no short cuts on Vergnoux's watch. So while Boyle may have felt like easing off to aid her recovery, she knew that would compromise the plan.
"I guess I didn't really want to reduce my workload too much. Fred works them pretty hard and I really didn't want to miss out on that."
Boyle, whose three world championship medals last year mark her as the country's best chance for a dais in Glasgow - and, whisper it, perhaps even a spot on top of it - competed at the Mare Nostrum meet in Monaco a fortnight ago, where she was fifth in the 400m freestyle, sixth in the 200m.
"It didn't go very well for me; it went pretty badly actually," she admitted.
Her problem now is getting an accurate gauge on how she's travelling just under five weeks out from the start of the Games.
"I guess I can say I'm working as hard as I can, hopefully will get better soon.
"I'm putting all my energy into preparing the best I can but I don't know what's going to happen.
"That's the beauty of sport; you never really know how it's going to go. However perfect your preparation is, it might go badly; and if you have a crap preparation sometimes it goes okay."
Boyle hoped to replicate the fine 2013 she had after working with Vergnoux in Sierra Nevada in January-February last year.
"It was really a challenge for me, a lot more work than I was used to, and different work. I wanted to do something like that this year, because I've really been looking for some kind of challenging environment."
As one swimming publication put it, Boyle and Spanish rival Mireia Belmonte had entered "a pact of pain" this year.
"Both Mireia and Lauren are professional athletes and training together has been really positive," Vergnoux said.
"The day Lauren arrived the training level went one step higher, which is great for both of them, and the rest of the group."
Boyle said Belmonte had an advantage in that she is more used to Vergnoux's regime. Still she's enjoyed the work.
An image of Boyle after her second Olympic final swim in London remains firm.
Having finished eighth in the 400m final, then fourth over the 16-lap 800m freestyle final, just two seconds off bronze, Boyle came into the mixed zone where media gather to interview athletes.
Two New Zealand journalists were there. She had no NZOC minder. Just herself.
The first question was of the 'how do you feel' variety. She started to answer, then broke down, tears of delight flowed. She had put the doubters in their place, as the first New Zealand woman into an Olympic final for 16 years.
Now, world championship success behind her, Boyle should be approaching Glasgow as one of the swimmers the others must see off, rather than a hopeful contender.
"I had a great year last year, it was a really good experience. I think it's helped me be more confident in my events."
Boyle's bronze medals in the 400m, 800m and 1500m freestyle at the worlds in Barcelona last year meant confidence blossomed. There is fresh self-assurance in what she is capable of achieving.
So roll on Glasgow, just shake off that bug as the first order of business.
Boyle, who will contest the 400m, 800m and 4 x 200m relay in Glasgow, will swim at a French meet early next month with other New Zealanders, then a camp in Mallorca before heading to Scotland.
