Most people’s mental models of energy are flawed: they think there’s a ‘tank’ of energy that gets depleted as you spend it. This may be roughly true for physical energy, but mental energy is different: spending mental energy on things that you consider productive or important gives you more mental energy for other things: a positive feedback loop.

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When you hit a tough point in a workout, Fader recommends focusing on in-the-moment instructional statements, like "One rep or mile at a time", because they keep you present, while lofty "You can do this!" platitudes don't match how you're feeling. If you're hiking and look up at the summit and think, "W

If you’re worried about it being too hot, he warned me, the worry itself will drain your energy tanks and increase your perception of effort long before the heat actually gets to you.

Sometimes slumps can be related to our mental health or inner state. Depression can make us feel unreasonably tired and make it tempting to stay on the couch or in bed all day. While it’s not a panacea, movement is one of the best ways to work through the fatigue that accompanies depression (along with adequate support from a mental health professi