Whatever you choose, pick it now, 

start small,  and begin proving to yourself that you can become the type of person you want to become.

Tiny habits, when repeated consistently, 

can be the difference between success or failure, confidence or doubt, and even happiness or depression.

From a great article written by James Clear called Natural Happiness: The Truth About Exercise and Depression.  He talks a lot about how proving to ourselves we can do something physically creates more capacity in our lives.  

It’s a great article …read it here: jamesclear.quora.com