Just a few notes on Gironda. He used to publish in the old Ironman magazine, then run by Peary Rader. Interesting old coot. Had some very original ideas. Stephen's link told some of the diet, but left a few things out. Gironda was running his athletes on what would be known later as a CKD, or cyclical ketogenic diet. His was 4 days of basically meat, leaves, berries, don't worry at all about fat content, and on the 5th day, you would hold the fat, and bring carbs up to moderate, then repeat. When I got out of the Army in 73, and got back to the States, I was going to school in the LA area, and actually visited his gym (then in Burbank) just to check out what it was all about. His routines are basically geared towards aesthetics, and you had to be invited in to work out there. He made no bones at all about it, and if he didn't like what you were doing, he'd toss you.His clients ere actors and bodybuilders trying to get into contest shape. And he did it very well.
As to training, well the link Stephen posted has a link in it to Poliquin's German Volume Training, which is very similar to gironda's 8X8, and Poliquin even mentions that he doesn't know if the Europeans came up with it first, or if Gironda did. I can tell you this about it. I did try the GVT as written by Poliquin, and went through the whole thing. You have to read it carefully. It's not all 10X10. During the high volume phases, with short rest breaks, I leaned up quite a bit. In the lower volume, much higher intensity phases, I did in fact get some size and a lot of strength, and that was at age 46. To paraphrase it briefly (but read the link) you do 4-5 cycles of 10X10, starting with around 60% 1RM, then go to a program of your choosing and work up to a couple of heavy sets per bodypart/lift for 3-4 weeks. At that point, you come back to the high volume, but this time at around 70%, and do 10X6 for a couple of cycles, and finally, finish off with a very intense , lower volume program, in which I choose the waed 1-6. You work up to a heavy but soable single, drop some weight , get 6reps, back to a single heavier than your first, then back to 6 but heavier than your first set of 6.
Not a bad program at all if that's what you're into.