Hm... I expect that I'm going to mess up my scheduling, or some family thing will crop up unexpectedly, and I won't wake up in time to run through the exercise routine before having to go out on some errand, on a day with so much going on that it's well past sunset before I have another chance to do some jumping up and down.
sounds similar to my experience. You might want to set up a review process once a week (Sunday night is usually convenient) so that you can check if you are still on track with the goal.
Minor failures or small setbacks will happen, finding a way to ensure they don't become drawn out failures will likely keep you on track.
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