Lifting and handling safely requires considerably more than knowing how to lift. Training people to lift/handle properly often does not give much protection because they then lift/handle heavier items and consequently lose all the benefit they might have gained by lifting better.
It also should be fairly obvious that the conditions shown in these drawings are not very like those under which ordinary people work. Where’s the clutter? And so on. An important rule about safe lifting is that it is safer when the conditions are as clean, tidy and perfect as possible. The most important of all is not to manually handle or lift if you can find a way to avoid doing so. Wherever possible use mechanical means, even the humble wheelbarrow or sack truck can greatly reduce the load.
Be aware that it is very tiring to carry loads. Much safer to move them using mechanical means. Certainly you should never carry heavy items more than 10 metres, without having planned the lift and rest points (even if only mentally).
A previous back injury predisposes towards further injury. If you have injured your back in the past, you should reduce the weights you consider safe to handle. This will need to take into consideration both the severity of the previous injury and your proneness to back injuries (have you had only one instance some time ago, or are your always "putting your back out" - the latter is much more of a risk factor than the former).
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