Chromatic is the term used for the scale that contains all 12 notes, i.e including sharps and flats.
So chromatic exercises are ones where you play every note like
E--------------------------------------------1-2-3-4
B-----------------------------------1-2-3-4----------
G--------------------------1-2-3-4--------------------
D------------------1-2-3-4----------------------------
A---------1-2-3-4-----------------------------------
E-1-2-3-4-------------------------------------------
You then keep going up and down.. there's plenty of variations out there.
As long as you stick with them you'll have strong fingers in no time.
Hope that helps
If you need any sites or exercises just let me know and I could fish something up.