Toe Walking

Josh started to walk when he was one year old and since then I never saw any walking problem with him.
He has a curve not a flat feet.
Currently, I do feel that he walked and run with his toe - mostly in a rush. 
But Hey, everything was a rush for an active toddler like him, so that "toe walking scene" almost seen by me all the time.

My guess, he has fun with it! Yeah Fun for him, worried for mommy :p

The trigger was he felt he can do something that he couldn't before when he tap on his toe. i.e. he could opened the door, he could reach something higher, take something from the table, etc.

Then suddenly, he did it for everything including walk and run with his toe. He will do the same when wearing a shoes and that made him unbalance and fall down.

I took a read in my helping library - Google and here i found several answer for calm me:

Babyzone.com: Up until the age of 3, this kind of behavior can be considered "normal" as children are learning to walk and do a fair amount of experimenting.  What begins as a fun way to get around can turn into a habit, though, and a cause of concern for many parents. This habitual tippy-toe walking is referred to as idiopathic toe walking. 

Children.web:Usually walking on tiptoes is not a problem. But if toe walking persists beyond the age of 2 or is done constantly, see your child's doctor for advice. Persistent toe walking, or toe walking on only one foot, can be a sign of a central nervous system problem and should be evaluated

More reading on: 

Parenting.com

Kidshealth.org

Then what should I do now?

Just Remind him all the time that he shall not walk with his toe. and of course pay attention whether there are any relation to feet problem.

P.S.: I started to wrote this topic on 19December, and when the topic posted, the toe walking reduce significantly (a time to time reminder did work for him).