I am a depth pig. Love it. If I could take a foot and leg, I'd go for it! For now, though, I'll settle on getting a big live paw up into the tranverse colon. I describe below how I trained specifically for depth. Got questions or comments?
Elbows, Biceps & More!

.....I suppose that because I had a struggle getting anything at all into me, I had a mindset from the beginning that was geared toward depth. Width obviously was required before I could take a hand, but those pics of a whole forearm in an ass just floated this boy's boat!
.....So, I had a goal—butt how to get there? I started off with micro-butt plugs and worked my way up to longer ones (only 6”). That was a fun quest, but soon I yearned for those black beauties sold by my two fav dildo-pushers, Big Sex Toy Store and Mr. S/Fetters.
.....My first big-time goal was the Dick Rambone dildo, a 2.5” by 15” “monster” (at least it seemed so at the time). While I worked with my wee toys, I had that on the bed beside me for inspiration.
.....My first toy to work on the sigmoid was a super-soft & super-flexible double-ended dildo. I could get it in about 7”  into the rectum, so I was feeling pretty heroic. But weeks went by and I didn’t get any deeper.
.....Then, one day after looking at an anatomy text, I laid on my left side, put my right knee over my left leg at 90 degrees… and all 14” of that puppy went in! I had to hang on the bottom head tightly or it would have migrated all the way north!
.....I just knew that I was ready for my old friend Dick Rambone. Because it had been “the impossible dream” though, I had a devil of a time just pushing in the head… but I forced myself to work on it steadily for two weeks. Soon, I was in 8”, but I just could not get in any further.
.....Then one fine day, I remembered something I’d read; there was a slingshot of muscle—the puborectal sling—that held up the rectum and forced a bend in the descending colon—the “S” curve that is the bane of so many fisters (Fig.1, below).
.....I remembered that it, like the external sphincter, is a voluntary muscle; with training, we can control it to some degree. I reasoned that if I could stretch my hamstrings, I should be able to (gently) stretch my slingshot and so develop a “straight pipe” for fisting.

Guess what… I’ll be damned if it didn’t work!

.....I started stretching it with thin, fairly flexible toys, then worked my way through more stiff toys, then wider toys over a period of four months. I soon could relax that slingshot at will (Fig.2, below). Actually, it got the plan down itself and would relax automatically as soon as I put a handful of fingers in my port. (I am a pig, remember.)

Fig 1. The slingshot at rest, making the dreaded "S" curve. (The sigmoid is actually a valve.) Fig 2. The slingshot all stretched out and ready for a man-fist & arm.

.....The big test day came when I lubed like crazy and put Dick Rambone to my love lips. In one smooth move, he slid all the way up to the balls—the whole 15" enchilada!
.....From there, getting the first fist in was a piece of cake. Within a month I was taking The Hand dildo past the sigmoid all the way to the transverse colon. Today, I often open with it.
.....One guy who fisted me on a run last year said, “Man you are soooo lucky! Your tube is just straight as an arrow.” I didn’t tell him that luck had nothing to do with it.
.....Now, having “straightened” my pipe, I’m working on deep width. I can get The Fist up to the transverse colon after making sure that I’ve opened up. Next step? Greg, then Victor, then Super Victor… you get the picture.

So who’s going to be first to get a real-live man-fist up there for me?