Holding myself accountable

I think that it is high time I do an exercise schedule.  It doesn't have to be fancy.  It is always good to plan ahead, just like with food.  I need to hold myself accountable and that is the problem.  I don't hold myself accountable enough.  I don't exercise enough.  I can exercise for 20-30 minutes tops on a treadmill but I know that I got to do more than that.  I have a lot to learn about myself.  I realize that I can do this.