I like when the media attempts to coin new terms. "Decision Fatigue", as this Globe and Mail article calls it, is the idea that in any given day you only have enough energy to make a finite number of "tough decisions", before you just do what you would normally just...do. The types of "tough decisions" they mean mostly relate to making smarter choices for your health; I'm going to the gym and I’m not going to have that treat that I want to eat right now. It's an interesting hypothesis, and I don't really know what to make of putting a definite limitation ones ability to overcome being tired. What did certainly catch my eye though is how I initially interpreted it: consciously deciding you're too tired to get out for a run or make it to the gym well before it's actually time to do it. I do this. All the time. Especially when I'm not training very hard or out really of my groove - as is currently the case.
For myself and those of you like me, there's really only one solution. Grab a bag a Ruffles' Sour Cream 'N Bacon chips (my fav), and settle into the couch for the night. Yes? Of course not. It takes real grit to just get out there and do it. Hell, do it half speed. Take longer breaks between sets. Just get out there and do it. I've actually been following my advice this week (before I even happened upon this article), up at 4:30am every morning for the gym and a couple 5km runs in the evenings. You know what? The worst part was really just the thought of going out and doing it. When I'm finally in the gym or mid-run, it feels really good! When it's over I feel great and I'm ready for the next one.
You can take the points from this article, and they may be very valid for you, but really the biggest challenge for most people is fully committing to something and getting over the various daily excuses that stand in your way. When you fully commit to something, be it healthier meals or a rigid fitness routine, the route to get there is yours for the taking.
Check out the article here, of course I fully support the planning and scheduling advice!