Be careful to look all around you.

If you are struggling to maintain discipline in any aspect of your life, check your blind spots.
Before you veer off path, look at what is creeping up beside you and waiting in the shadows to ambush you.

Get tough and stay the course you have set. There are always reasons not to do something you set your mind to. The important thing is to keep laser focused on the road map you have adopted as your own.