2010-2011 55m Training

ive read a bunch of stuff about overtraining but i seem to be doing fine. i want to really increase my work capacity over the summer. obviously ill cut some once my running speed increases in fall and a bunch when i get in season and are doing full speed running

im doing higher reps on weights and no real full speed running so as far as a muscular standpoint i think im safe from injury

i dont completely understand what makes something more or less tolling on the cns though, any chance i could be overdoing that without knowing?