What's Wrong with Me?

I am so not motivated to exercise.  What is going on?  This feels like the hardest in my life to get motivated.  Last month was very stressful for me and I've gained some kg's.  So there is an urgency to lose it.

I go walking a few miles almost everyday.  But walking just doesn't do it for me.  I keep hearing how walking is good for you, but it just doesn't do anything for me like running does.

Not sure what I should do.....awrrrr!!