No, that's not overtraining at all, you've found what works for you. I agree that allot of people are afraid of overtraining. But there are very distint signs that a person needs to look for if they suspect that they're overtraining like, lack of progess, not being able to sleep, lack of appetite, being moody, etc.
There is one member in particular that doesn't like to hear this but it's true, everybody is different to a certain extent. My workout may not work for you, but your workout may work for Prince but not for me. You can think of all kinds of combinations that will work for some but not necessarily for others. It's very laughable to me to read a post by somebody (I'm talking about on other boards) that say that this workout will definitely work for you. Well it may but it may not, how do they know. Just because it works for them doesn't mean that it will work for you and if they say it will, they''re just telling you a bold-face lie because they don't know.
I offer suggestions to people and even design entire pograms in some cases. But I always say up front that this may or may not work for them and if it doesn't work just let me know and I'll make some changes. Some people respond to 30 minutes a day 5 days a week and others respond the best to 2 hours a day 3 days a week. Who am I to say that somebody is training the wrong way when there are so many varibles to consider.
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If you build it they will come