These are some of the rights one must do for expressing his gratitude to Allah over the joints and health his body is in. There are different ways to express such gratitude and what combines and suffices for all is Duha prayer. This prayer is not mandatory.

There is an authentic hadeeth about a charity, which must be given every morning. Also the Prophet (pbuh) said that 2 rakaats of duha make up for this charity. I wanted to know, is this charity obligatory? Does it have to be done every morning?