Why does my body make popping noises alot?

so you know how some ppl like to pop there knuckles alot. Well my body does it all the time mostly my legs and feet.evertime I lay down when I get back up my feet and legs just pop pop lol and I mean EVERY time. my BF calls me bubble wrap cuz of it haha I'm not insecure or really worried about it I jus wanna know why it always happens?