I received this question at the end of class today = "Is it okay if I put my hands on the floor during Warrior III?"
Absolutely! One huge thing that we're working on in Vinyasa practice is being able to adapt to the needs of the moment...the truth of the moment. Working to not be attached to a certain way of doing things. For example... I've just had you go thru a very difficult combination of postures and movements and you've become a little winded and now you're in boat pose...and I say, "If you've lost your breath catch it here."
Wait what!? In boat pose? That's right. Perhaps you're boat is usually tip top...looks like a perfect V...yoga journal cover stuff. Can you adapt the posture, perhaps bending the knees, so that you can catch your breath? This requires removing ego from the action. Humility. Bravery. True confidence. Watch out though...ego is tricky...you may start adapting postures so that is appears to others that you're evolved. ;)
Some great questions to ask yourself to evaluate your actions are... What am I doing and why? What am I not doing and why?