I played guitar from 12 to 23, but haven't really played for the last 5 years and would like to start again.

However, when I used to play I rarely used the pinky finger because I have big hands (not an excuse, but this is how it happened).

Now that I almost forgot how to play after a long absence I thought, "Why don't I start training the pinky from scratch?"

What are the best exercises/techniques to train the pinky?