You can use your legs to pick something up or your can use your back. Most often, people will use both. You are expecting more work than necessary so you position yourself in anticipation. As you put extra effort into the lift, it takes you further than expected – and now your back is in a position where you have less balance. It is in that moment of realize that you have lost balance, that your mind pays very particular attention, maybe even startled when you consider you were expecting to be balanced!
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