In moments where you have nothing to do (sitting on the bus, watching tv), you could train your hands by tapping on you knee for example. You could also stretch your fingers backwards and try to counter that with your finger muscles to basically train them.

Also, what really helped me building strength in my left pinky was starting to play the piano.
I have pretty small hands and for me it really really helped a lot :).
On top of that, I can play a bit of piano now :).

Building hand strength for when tapping on the guitar
I have very complex model. The flow is like this:
- in controller I populate the model from the database
- in view I have several tabs. After I fill in the info on the first tab, the second tab enables (this works just fine) and on click on the second tab button I need to update some properties of the model. How can I do this WITHOUT calling the database again in order to populate the model on the controller? The model is very complex, so I can't store as "hidden" all the properties.  

I hope I managed to be clear enough. 
Thanks for any kind of help
