Can anyone give me some help with flexibility?

Currently my flexibility is crap. I can't even do a 3-5-7 stretch while keeping the index on its proper fret. Even if I try it with removing the index, I can't get more than half way into the fifth fret without resorting to my ring finger. But even with my ring finger I can't legato anything with a 3-5-7 in it.
Ya, I have short fingers, when I started I couldn't do a 5-7-9 say.
Now I can do a 1-3-5 stretch.
Try playing those 2 fret gap ones closer to the bridge, then gradually move down.
On playing the Paul Gilbert signature at the guitar store extensively, my missus sighed:
"Put it down now, It's like you love that guitar more than me!"
In Which I replied.
"Well it has got two F-Holes!"