24 y/o athletic build, 161lbs 5'7 pre op now 148lbs. I had BBL sept 2015. Im very sporty and i lift heavy weights with no problem but tried to run today and my butt feels sore when running. It's like the fat is not attached to the body and feels like a "foreign" material jumping up and down every step i take and its extra sore when i run fast. Fast walking, row machine etc. - no problem. Is this normal? No other problems and its only sore when i run