Why is your body less prone to breaking when you fall/ get thrown hard when you are relaxed?

Question

Why is your body safer and less prone to breaking when you are relaxed when you hit something at high speeds or with great force?

In: Biology

Answer 1

Most peoples muscular-skeletal system (tendons and muscles) are only strong enough to support their own body weight give or take fifty percent. (100-300lbs)

But as a block of meat, not trying to support our weight with our muscles, we can support many times that. like fighter pilots pulling 6Gs (600-1800lbs) where the seat supports all the weight.