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In bodybuilding or weightlifting, if you are going to attempt to lift a weight at the maximum of your current ability, you need to prepare before the lift and be completely focused during the lift. Any activity at the limits of your ability will require full concentration and effort. And, of course, in fields where strength and endurance are not so important -- intellectual activities, musical performance, art, and so on -- there is little point at all to practicing if you don't focus.