Nice. Trying to picture the position you are in, but having a difficult time. A pic would always help of course. ;-) But I suppose it sounds like a variation of this post, but standing up. As for trying this predicament position yourself, as I mentioned in a comment above that you may not have seen yet, you can get on the floor on your knees with a bed or chair in front of you, and put your forehead leaning over the bed or chair. You can start with your knees more forward on the floor. Then you can reposition yourself with your knees further back. Then use your hands to get into position, but then lift your hands off the floor to feel the true effect of the predicament, with your hands behind your back like my sub in this post, or as close to that as you can get. Although it's not exactly the same with your head supported, it will be fairly close, and it should be enough to feel the difference in the effect on your thighs. If you give that another try that way, let me know if you notice the difference, and get a better glimpse of just how intense this predicament position was for my sub...and let us know about how long you think you could have endured that position for.