i don't care what you are running, you don't ever want to "overtrain" anything... your output might increase but that is a big difference than what you would refer to as "overtraining" Eventually, overtraining will cause an adverse effect and you will actually lose size as opposed to gaining it... your abilities to produce more will go up but you utilize that with trying to build strength and muscular endurance, not training extra hours and overworking your muscles which leads to them not being able to grow because they are constantly torn down and never allowed recovery which would result in growth.... keep that in mind, allow them recover and grow...