Replying to G's in a Flip

I was doing the water ramps on skates yesterday (ply wood down a hill and 4' kicker into water) and i did a dubble back when i was doing it it felt like there was alot of G's. I had done dubble backs befor (last sesion) but for some reson when i did it this time it felt like i was pulling a few G's. Is this in my imagnation or can this happen when doing flips.




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