overtraining

Ok so I read about over-training and I can't help but wonder if I am over-training I have absolutely no time for gym because nearly school is taking up more and more of my time, so I just do some exercises at home. here's my routine, pretty simple 10 sets of 10 rep push-ups 5 sets of 45...

Hi, I'm haven't exercised for almost a year now and wonder if 3 hours biking plus some squats everyday will be overtraining?, I'm 22 by the way

I have worked out my shoulders and triceps on Wednesday and its very sour. If i do my chest on Friday will i be over training my tricpes

day 1: triceps, chest, shoulders day 2: back, legs, biceps day 3: rest then repeat for each muscle group, (for example legs), i would do 3 exercises with 3 sets of 8-10 (for example, leg extentions, curls, and squats, making that 12 total sets)