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Thanks everybody, really very interesting discussion. The discussion so far suggest that Gravity exert force on the muscles. To counter that force the muscles burn energy derived from breaking of ATP molecules. The muscles get tired first becouse of the decreased levels of energy released...

Thanks for the suggestion, that has now been put up in the Space, Math and Physics forum.

It is probably a simple question. I am curious to know 'Why do we feel tired while holding a weight in our hand or heads for a longer time?' It is probably very simple question and most of the people can alswer it. But I am just curious to know the actual causes and their impact in terms of law...

Interesting indeed! Responses are very interesting. Infact I just wanted to know, 'Why do we feel tired while holding a weight in our hand or heads for a longer time?' It is probably very simple question and most of the people can alswer it. But I am just curious to know the actual causes and...

Hi thank you everybody. It is really amazing to visit this interesting site with so many super professionals. I understand that it will be both interesting as well as an arduous task to participate in discussion on this forum.

Hi everybody, :)