Skill 12 of 14
In Progress

The human body “machine”

It’s tough to hold up a backpack. You can’t do that forever – eventually you will fall down under the weight. So, you are doing a lot of work, right? And when you have spent all your energy via work to hold it, then you drop it and have to rest, right?


That same backpack can easily be held up by a table. Forever.1 The table will never get tired.

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  1. How To Calculate The Energy Expenditure Of Weightlifters’ (web page), Dresdin Archibald, Breaking Muscle, 2017, www.breakingmuscle.com/fitness/how-to-calculate-the-energy-expenditure-of-weightlifters (accessed Jul. 7th, 2020)