[quote name='ZMech' timestamp='1320234277' post='1424007']
An exercise my mate showed me when I started, which I find useful was to play the classic 50's walking bassline, making sure to play one finger per fret style. If you start highish up the neck, the stretch shouldn't be a problem, and you can gradually move further up as your fingers get used to stretching. In tab, it would be as follows if played in C:
-------------------------------------------------------------7-8-7------
------------7-8-7-------------------7-8-7----------7-10-------7-10-
-------7-10--------10-7----7-10---------10-7-8--------------------
----8----------------------8--------------------------------------------
-------------------------------------7----------------------------------------
--------------7-8-7--------------9---9-----7-10-7----------7-8-7-------
-------7-10---------10-7---10---------8--------------7-10-------10-7--
----8--------------------------------------------------8----------------------
You should be using index finger on the 7th fret, middle on 8th, ring on 9th and pinky on the 10th when playing this. I still find this tiring to play in G. Try youtubing a few videos, see if any of them make sense. Also, your left hand should resemble the picture below, with your thumb on the back of the neck, not round the side, else you won't be able to spread your fingers in the slightest (it's comfy, but unhelpful).
One last thing, experiment with how softly you actually [u]need[/u] to fret to ring a clear note without buzzing, it's hardly any force at all.
[/quote]
Agree totally, thumb position is everything, and with your thumb in this position your hand will naturally 'spread out'.