[darioush]

I'd like to add: if things aren't going well for you running more may not be the answer.

Source: I learned all about my terrible running form that kept sending me back to physical therapy by a doctor who actually bothered to look at me running and cared enough about the biomechanics to tell me what I was doing wrong.

Just like math and science (or arts or music) doesn't come naturally to everyone, the same is being connected with and in control of the muscles in your body. If you've spent the bulk of your adolescent and adult life in a chair (like I did), chances are your core muscles and stabilizers are weak and you won't be utilizing them correctly just by running more.