Wow, once I got over the sick aspect of this thread, it became rather interesting. I'm 6' and 150 lbs. Although I'm not the most well built guy out there, I'm not exactly the scrawniest either. The true challenge in this setting is not simple endurance, but endurance that also minimizes damage taken.
These children have received one day's training in taking me down. That means they'll be going for weak spots and attacking somewhat effectively. Pinching and biting is likely, and if they go for the upper arm or inner thigh (this hurts really, really bad; try it), the pain could prove quite distracting and either lead to an excessive use of stamina or being overtaken.
Thus, maintaining a distance that is between my reach and their's is the optimal situation. Legs are longer than arms and pack much more of a punch than, well punches. Even if they attempt to block, I'm quite confident my kick could go through it. However, evasive maneuvers could be a problem. My kicks will have to be quick in order to make sure that another bugger couldn't sneak in while I'm attacking and yet thorough enough to make up for any movement.
My strategy is to use quick, sweeping kicks that rely on centrifugal momentum to minimize energy used. Also, the kids would probably be kicked backwards or sideways and slow down kids behind him in the process.
If I successfully executed this strategy, I might be looking at 30-40 kids.
