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The food we eat is converted into glucose and this glucose provides us necessary energy to do work which is absorbed by muscles.

So for instant energy glucose is directly taken and it is absorbed easily by our muscles and that energy can be used for later activities.

Hence for instant energy sportsmen drink glucose or take glucose tablets.
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To perform all of the activities we need a sports person needs a lot of energy to play ,for this he drinks glucose and takes glucose tablets.These gives him more energy.
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