Here’s some reasons why many people often don’t do what they plan for, in my experience:  

1. They try to do too much (one area I’ve had to learn a lot in myself)

2. They don’t set clear and definite priorities.

3. They don’t allow for unexpected interruptions.

4. They find it hard to say ‘No’.

5. They spend too much time online and on email

6. They go to meetings they shouldn’t go to and waste too much time at meetings in general

   7.  They aren’t hungry enough for what they’ve planned for…