19 hours fast and into 40 minutes of very hard sled pulling, two minutes of intense gasping for air between 50 yard pulls, and then heavy weighted ab work. Felt really good. I can't say I felt any differently then my usual workout... However, at an hour I felt froggy enough to keep at it, unfortunately or fortunately maybe I had to stop to make an appointment. I felt no mental instability that I was aware of, and at 20.5 and after this hard work I still had no detrimental nutritional feeling that I was aware of either. And it takes a lot of concentration to force oneself to breath properly at +4 sled trips... 60+ish yards each. 2 ProwlerII trips light, 2 ProwlerII trips heavy, 2 rope pull trips heavy forward facing, 2 rope pull trips heavy rear facing, 2 heavy ankle pull trips forward facing, 2 ankle pull trips heavy rear facing, and then two more ProwlerII pushing trips heavy. I felt like I could have went 4s. Work capacity, mental fortitude, how to strain, it goes on and on, I like me some sled pulling, but that's another thread...
I was really surprised at how energetic I felt, but again I have the stored energy available for use, so I am sure that is a contributing factor.
Broke fast around 21ish with two pears and an avocado and two heaping tablespoons coconut oil just shoveled into stomach. Then 2 hours later some buffalo sirloin and grass finished bovine sirloin, first time from this farm too best sirloin I ever had it was good raw

. 4 slices of bread making two very rare lots o meat sandwiches. one slice of bread with a heaping tablespoon peanut butter bout a 1/5 cup almond, walnut, pecan mix, and a tablespoon coconut oil spread onto other side of bread, this was while I was cooking the steaks on the broiler in the cast iron.
https://secure.lodgemfg.com/storefro...idProduct=3940 WFS You'll never eat steak any other way again, except for a very good prime rib...
I tell ya what though... I had no problem whatsoever eating the calories, and I didn't even feel ravenous during the protein time, but the pears did get devoured rather hastily

, but it was more happiness at success.
I could see where fasted work could support two-a-days easily. Conjugate work early fasted. Break fast slowly up to heavy second workout later in the day.
I can DEFINITELY see how one would NOT want to go too low with body fat storage if one wants to maintain work capacity beyond an hour. I'm talking about working moving heavy stuff, not just bodyweight.
Feel absolutely fantastic this morning, getting ready to go hit it again for more sled pulling and conjugate work. will break fast much earlier today, the I part

. Heavy squats somewhere between 2-5PM.
Life is a sin wave, back and forth, two different every states, cycle, repeat forever. Just interested in "real world" experiences simply on number of hours of fast into training. Not how many days in a row, I have yet to fast for 2 consecutive days longer then 12 hours. Not anything else, the only question I posit here is peak hours of fast pre-training. For me on this one test so far it seems like I can do some really significant work on 19 hours of fast, when that 19 hour fast follows a couple days of shorter 12 hours fasts, and have no problem whatsoever putting down 2K+ calories inside of a few hour very small eating window.
Train hard! Thought determines reality!