noticed over the past few weeks or so that my range of mobility for bending has been fucked, lower back muscles are extremely tense and now I can't even touch my toes without exerting an absurd amount of effort and patience for my back to loosen up. standing up from a chair takes a few seconds for my lower back to get adjusted. i feel like an old fart. what are some ways to loosen up the lower back? will it simply fix itself with time? should i stop doing exercises for now that make use of the lower back, or at least do greatly reduced workloads with them?