I don't think, when jumping in general, your body makes much of an angle. What happens when going up, is that the legs also sweep up in sort of a cycling motion. This happens especially when jumping after running. Your legs almost naturally make that motion. From standing still its a bit more unusual for casual jumping, but when you try to jump higher, it's not that weird.
Here is how I made my jumping animation (just to let you know: I didn't use reference for it at all so it's probably crap, but it will give you an idea)
First I go trough knees to start the jump. The good thing about 3D engines, is that animation blend into each other, so it's not a very long part.
Then we move up with one knee up
Then move the other knee up for the cycling motion
Fall down pose. Here I just let the animation loop with slight movement of the arms going up and down.
To give a feeling of weight to the character, after touching the ground, move trough the knees in one frame and go up in two (at least make going back up slower then going down.
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