Why Can't a Weight Lifter Float in Air?

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A weight lifter weighing 100 Kg can lift 120 Kg but cannot float in the air because he needs a ground reaction force to do so. Jumping is a way to momentarily lift off the ground, but it still relies on this principle. The discussion emphasizes Newton's third law: for every action, there is an equal and opposite reaction. Without a solid surface to push against, a weight lifter cannot generate the necessary force to lift himself off the ground. Therefore, the inability to float is fundamentally linked to the need for ground support.
parthivsmehta
A weight lifter weights 100 Kg and can lift 120 Kg of weight, so why can’t he carry himself and float in air for few seconds??
 
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He can - it is called 'jumping'
 
Adrian Baker's answer was pretty good but I think what you are looking for is "for every action there there is an equal and opposite reaction". In order for a weight lifter to lift a weight, he has press down on the ground with an equal force- no ground, no force, no lift.
 

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