Therefore, before we get started, you're going to need to get the strongest possible children. Which is difficult. Children don't respond that well to conventional strength training, and few have the appetite for the 15 daily chicken breasts and creatine shakes necessary for such training. Anabolic steroids are another option I'm going to recommend strongly against, due to the health risks they pose, and of course their illegality.
"I'm pleasantly surprised to see this is one of your responsible columns, Mr. Bucholz."
Also their cost.
"I'm glad to see this is one of your mostly responsible columns, Mr. Bucholz."
The same goes for exposing them to gamma ray blasts, radioactive spiders, or basically anything from Issue #1 of any Marvel Comics brand. No, instead I'm going to recommend that you use actual science, in this case natural selection.