I was brought up as a Roman Catholic, and whilst I would have to admit I am probably the most lapsed one out there, I always give up something for Lent. It's tradition, it's how I was brought up and it's just what I do.
This year, I made the decision to give up energy drinks. It was getting to the point where I would struggle to concentrate unless I had one, but since my hours were changed from 8-4 to 9-5 I find my sleep rhythm is better, I'm getting to the gym regularly before work and I have far more energy.
This is in part being helped by drinking Matcha tea daily.