Make it part of your schedule:

Achievement rewards routine. 

As an extreme example, consider the early morning schedule of Apple CEO Tim Cook. He gets up 3:45 am day by day, guaranteeing that it permits him to traverse the 700 or so messages he gets every day, and gives his time to work out before he goes into the workpl...

When an action step is part of your routine, you are bound to resist it less. This helps you preserve your energy and attention span for more difficult tasks that aren’t easily automated. 

Schedule your habits by giving them a specific space in your daily waking hours. You can put it in your calendar, or link it to your current behavior patterns. 

Create a system around your existing life to incorporate the new habit.