Anyone ever done this? Did it help heaps?
that could be the most open ended unspecific question ever…
It depends on how good you are now. How the program is structured. If you actually stick with the program. and on and on.
Two months is a start of training maybe a base period. You can make it more then just a base period but depending on what you actual goals on that may be pointless also.
Grant
yes i know…it is the 2 months prior to an ironman. i already have a pretty big base averaging 15-20 hours a week for most of the year. plus i trained through all of winter…something i have never really done properly before.
I know nothing about training for Ironman so i’m not going to start making stuff up.
In the two to three months after my last race this year i did bring my 1500 swim time down about 8 mins and my 5k time down 2.5. Which doesn’t seem like a lot but that would put me around 2:12 for an olympic next year. So yeah you can do a lot in two months it just depends how hard you want to work.
Grant
When I left high school, I spent three months doing nothing but training… it made a huge difference! I basically managed to increase the volume I could cope with drastically. I went from swimming 1:38 / 100m to 1:22 (had never done any drills, and they made a huge difference), and went from running very spontaneously to running 6 days / week, and maintained cycling (around 58 min / 40k). My running didn’t improve much, but I could cope with the training much better. Now, 6 months later (and training almost full time), my running has started to improve drastically, cycling is still about the same and swimming has actually become worse - back to 1:33 / 100m ish (didn’t swim much, and did no drills, for just 6 weeks).
So basically, with my n=1 sample, you can improve a lot if you put in the effort - I swam 7 days a week (1 v. easy though - just drills), cycled 6 and ran 6.
For those of you interested in how my swimming became really slow again - I think I have developed some asymmetry in my stroke since I always breathe on one side, so I am now putting in much more mileage, all of it bilateral to try and get my times down again.
Try swimming with a Finis or Lane4 swim snorkel.
2 months worth ;^)
Ric
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I brought my 1/2IM time from 5:48 down to 4:56 this summer with 7 weeks of dedicated training. So that’s how much I can improve (hey, that’s what you asked 
My training prior to the 5:48 was only about 5-6 hours/week and I had built up to 12-15 hours/week before the 4:56.
Improve is a relative term.
If you have specific benchmarks (say, cycling FT), there is plenty of data to show how a specific training program can improve various outputs.
I agree with the poster above me. “Improvement is relative.”
I further believe that when you put together 2 months of training, your improvement is limitless; because, you’re hooked!
Train hard. Live well. Vacation often!