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I asked this question on physics.stackexchange.com for you: http://physics.stackexchange.com/questions/9129/what-is-the-force-on-the-arms-in-a-pushuphttps://physics.stackexchange.com/questions/9129/what-is-the-force-on-the-arms-in-a-pushup . The answer is 50% of your body weight assuming equal distribution of mass vertically and weightless arms and head. It will be more than 50% when you factor in arm and head weight and your exact vertical mass distribution. If you're top heavy, you're pushing more weight. If you're bottom heavy, you're pushing less weight.

I asked this question on physics.stackexchange.com for you: http://physics.stackexchange.com/questions/9129/what-is-the-force-on-the-arms-in-a-pushup . The answer is 50% of your body weight assuming equal distribution of mass vertically and weightless arms and head. It will be more than 50% when you factor in arm and head weight and your exact vertical mass distribution. If you're top heavy, you're pushing more weight. If you're bottom heavy, you're pushing less weight.

I asked this question on physics.stackexchange.com for you: https://physics.stackexchange.com/questions/9129/what-is-the-force-on-the-arms-in-a-pushup . The answer is 50% of your body weight assuming equal distribution of mass vertically and weightless arms and head. It will be more than 50% when you factor in arm and head weight and your exact vertical mass distribution. If you're top heavy, you're pushing more weight. If you're bottom heavy, you're pushing less weight.

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I asked this question on physics.stackexchange.com for you: http://physics.stackexchange.com/questions/9129/what-is-the-force-on-the-arms-in-a-pushup . The answer is 50% of your body weight assuming equal distribution of mass vertically and weightless arms and head. It will be more than 50% when you factor in arm and head weight and your exact vertical mass distribution. If you're top heavy, you're pushing more weight. If you're bottom heavy, you're pushing less weight.