Most of the stuff I've read, basically has this to say about high reps for endurance : There isn't much point. Building endurance with 12-15 reps, or even 40-50 reps or low weight just isn't really worth it, to do real endurance training for a particular muscle group, you need to look at doing things for 30 minutes to an hour. (so for back/chest/arms go swimming (hard) for as long as you can etc)
Also, as far as getting huge, or not, as the case may be, diet has a pretty important factor. If you are taking in enough calories to just take care of the work you do over the course of the day, you won't put on any serious muscle mass to worry about.
As far as the body unbuilding comment, if you are not happy with the size you are getting, the only real solutions is along the lines of what debaser said. Do hard endurance work, running, swimming, riding, whatever your poison, and keep a slight (VERY slight) caloric deficit. That'll slowly take off the muscle mass, but you will get a bit weaker... But seriously, talk to a personal trainer or someone from your local college/university in kinesiology for a real solution.
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