I’ll chime in here because I have been doing a regular routine of extreme Ulis using a multi-clamp:
The objective of extreme Ulis, as ICM pointed out, is to stimulate an erection and slowly and completely restrict the out-flow but not the in-flow of blood. Ideally you will exceed the internal pressure that a normal erection creates.
This can only be accomplished by beginning stimulation in a flaccid/semi-erect state and incrementally increasing the constriction of out-flow while maintaining normal in-flow. Done any other way you will simply be clamping down on an erection, or unable to achieve an erection - both of which render the entire exercise moot.
Clamping off both the in and out flow of blood on a 100% erection can only result in a clamped off 100% erection. If having and maintaining 100% erection resulted in girth gains we would all have monster girth by the end of puberty.
It is certainly possible to limit the out-flow of blood and get results, as Hugh explained his technique, but as he stated that will require continual stimulation in order to maintain a high level of internal pressure.
With traditional extreme Ulis, if timed properly, you should not have to continue stimulation in order to maintain the erection. Ultimately the result should be a visible lateral expansion; although the erection might seem to be “softening” you will notice that it is not reducing in size - what is taking place is this expansion. This expansion should be evident after 2-3 consecutive sets.
The application of a heat source will also help encourage this.
BTW- as has been stated, this is for seriously conditioned units only. I wouldn’t even attempt these until having put in at least a month of the traditional Newbie routine.
Erect bends and/or jelqing in this state also strikes me as particularly risky.
-Cap