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How much energy to double jump?

We're talking about an ability that enables double jump now, so is not necessary related to energy.
 
Uh no, think of it this way
How much force would it take to kick a crumb of bread so hard that you propel yourself in the opposite direction
Now that, but instead of crumbs you’d just use the friction of the air
 
Double jump is just one of those things you take with a grain of salt unless otherwise treated as a strength feat of sorts. Even the calculation on reddit treats with the sole assumption that air does not displace and compresses when you jump on it.

It's physically impossible otherwise and no amount of force can stop air from simply displacing when you try to jump on it
 
And yet it doesn’t happen with birds
I understand that it’s easier for birds it’s easier due to the nature of wings, but the concept of it is still the same, there’s no reason it should be infinitely harder for something without wings to push on air
 
That's false equivalence given birds being able to fly are a combination of physiological and physical factors that human feet simply don't have
 
Feet do not have the surface of a wing so whatever air you push down is more likely to be displaced to the side rather than be pushed downwards to generate lift, and that's only assuming that this is how the mechanics of said double jump is explicitly described, instead of stuff like game mechanics, devices or limited Flight. The chances of it being scaled to power are just imo, very low
 
That's false equivalence given birds being able to fly are a combination of physiological and physical factors that human feet simply don't have
Human limitations are thrown out the window right now, obviously I’m not about to argue you or I can actually double jump. But let’s say you were a superhuman, then we would be able to
 
Feet do not have the surface of a wing so whatever air you push down is more likely to be displaced to the side rather than be pushed downwards to generate lift, and that's only assuming that this is how the mechanics of said double jump is explicitly described, instead of stuff like game mechanics, devices or limited Flight. The chances of it being scaled to power are just imo, very low
It is more likely to be displaced but not guaranteed
In other words it is still possible, just far more difficult, and we are trying to find out how difficult it would be to hypothetically double jump
 
So here is a real question. how much energy does it take for a human to fly using his arms as wings by flapping them?
 
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