When breaking routine, ensure that you pay attention to these changes and how they affect you. It is your responsibility to ensure the very routine you uphold does the most in serving you toward your vision, and so when you step out of it (via routine testing or otherwise), see if these changes to that routine bargain for the better. In most instances this routine would be a ‘cheat’ meal on a diet, in these cases one may find that their diet of eating is far superior. When it comes to adjusting when you exercise or when you do some other thing, see how that affects the dynamics of the day, are you more productive within that task when it is done at certain times? Does it have a snowball effect on the rest of the day?
Routine, ironically, is something to be changed and tested. In saying this, it is noted that one must give the routine the due process of time before concluding it’s efficacy or rather what changes are needed. 90 to 110 days would serve that balance, after which, test it and see. Change too much all at once, and you risk losing track of the adjustments and their effects, change too little and you have less leverage and stimulus for analysis. 1-2 things at any one time would work well, this (as always) scales and adjusts itself to the self that enacts it.
Routines are to serve you in discipline, change is constant.
Use discernment.