A:AnswerI don’t know about sweatproof but I think they will shift (rotate) on your head if you are laying prone on a bench pressing weights. You would probably be better off with some type of EarPods that wrap around your ear.
A:AnswerNot sure about the exact weight. I do know that they are about the same weight as my gaming headphones. The beats studio 3 fit a bit tighter but comfortably. Nowhere near 9 pounds. Closer to the 0.57 pounds.
A:AnswerRemove the small box that's comes with the headphones inside and then remove the bottom part like you did first when you opened the box and is under with the USB charging cable and it comes with another cable.
A:AnswerThey should be able to connect to the any TV or streaming device that supports Bluetooth. They will actually connect to an Apple TV over wifi, which does mean more audio information can be sent to the headphones for better quality sound.