In a hundred years people will probably have so advanced tech, people so that people won't have to move all day if they didn't want to because there'll probably be holograms and robots, even though there already are. Life will be so easy in the future for most people there will be robots that will do everything if you tell them to. you could probably have glasses that is actually a robot and you just have to say, "hey google hologram call Alex". There might be shrink rays or enlarge guns, there might be hover boards, or flying cars and stuff like that. In a hundred years we might not even be around.