I personally don't believe in overtraining, i think if you can handle the workouts and the next day be ready for it again then its fine. Back in the day guys were in the gym working out for hours upon hours, before that men worked labor intensive jobs, before that built shit and hunted and trained for wars and battles. Not until recently has the science come into play and guys are doing minimal workouts but notice how they do maximum amounts of gear lol i think overtraining is when you go far beyond the point of your body telling you to give up, if you're eating enough, taking your shit responsibly and getting rest, do what works for you bro

I work out 6-7 days a week, very intense and most days i work the same muscle groups but i do make sure i hit every body part weekly and i listen to my body, if I'm overly sore in an area I'll give that part a break for a day or two then hit it hard again when its ready. I've been seeing crazy gains from this and it'll slow down eventually but i think it works because my body never gets the chance to adapt like it would on a program, its a different thing every day whether it be reps, weight, intensity and order i do shit in and thats how it would be for us in the wild each day would be a new challenge and i truly believe thats how our bodies are supposed to work ... many people will disagree with me on this but it works for me, and i accept that we are all different and what works for one may not work for all