Fast.

I was so upset when i heard some people saying that fasting gives them a headache and they think that these type of islamic rules are funny and wrong.
I actually disagree with this statement as its wrong fast does not only helps you to be patient but it also helps you with your digestion system. It reminds you of Imam Hussain's thirst and hunger.
I think wearing scarf is difficult than fasting but when you first try it and think positively about it, it really becomes easy.