When you expect something to take a lot of effort, you prepare your body to exert the required force. This can be conscious actions, like making sure you have a solid footing, and getting down to “lift with your legs,” and unconscious ones, like bracing your core, and taking a breath. Also, when you’re lifting something that’s close to the limits of your strength, you’re probably paying a lot more attention to the signals your body is giving you, and will stop the second anything starts to feel funny. On the other hand, when you don’t expect something to be challenging, you’ll usually just start pushing or pulling from the position you’re already in. This is normally fine, but when the task ends up being harder than expected, something goes wrong halfway through (like losing your footing, and thus your balance), or you repeat the same awkward motion over and over again, injuries happen.
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