This is a great exercise to strength your left hand
The Spider exercise
1=first finger 2=second 3=third 4=four
G ------------------------------------
D -------------------------------------
A ------33-------44------11-----22
E 11-------22--------33------44---
G -------------------------------------
D ------33-------44------11-----22
A --------------------------------------
E 11-------22--------33------44---
G ------33-------44------11-----22
D--------------------------------------
A --------------------------------------
E 11-------22--------33------44---
This exercise is specifically designed to help you control excessive left hand movement when playing the bass. It helps you keep your fingers 'Low" over the fingerboard. Sometimes the fingers on the left hand can 'Jump" off the fingerboard creating extra unneeded movement there by preventing good economy of motion and good technique. It again is an exercise designed to help you apply this 'Low over the fingerboard" concept to the rest of the things you play.
If you do this every day, starting a fret 12 and going all the way down to 1 in not too much time you will be able to do 1 to 12 not matter how big your hands. Remember with God all things are possible
Blessings
Angua (hope it makes sense)