Practicing handstands improves body awareness, and boosts self-confidence and self-esteem. Achieving each step in a handstand and the challenges associated with them creates a great sense of accomplishment. 

I also find practicing them improves my focus, as I need to be calm to balance and focus on the details. I find it akin to mindfulness because it can be frustrating but getting frustrated makes it worse ( so breathe, be calm, grounded and try again). 

I enjoy the puzzle of balance keeping the body in alignment to balance. There is always something that can be improved or new transitions to learn. The journey is endless and wonderful.