Consistency has a side-effect: Feeling bored. As the brain is wired for novelty, it provides us with seemingly unpleasant feelings and emotions, and the problem is that we take those seriously.
Instead of fighting over the frustration, boredom or despair that arises in us, we need to ignore it and spice up our routine with variety.
Changing small details and techniques(like changing your exercise route or routine) helps us infuse some exciting variety into our mundane tasks.