Mike Pedersen has been in the golf fitness business for a long time. He's done a few stretch videos that aren't difficult, and posted them on YouTube. This particular two-stretch combo looked to be particularly easy, while still helping you get "unkinked."
This really is the sort of thing you can do a few times a day. And you don't have to do these outdoors, so you can't use the weather as an excuse. (Well, I suppose you could try...)