For most of my life I've had terrible posture. I've had a mostly sedentary lifestyle, my back arches when I sit (slouching), a forward-head posture when I walk. It does not cause me any pains yet (47yo) although I do sometimes feel a need to lie down for what I think achieves spine decompression.
I have recently decided I want to start doing a bunch of different exercises to improve my core strength, pay more attention to posture, and generally be a bit more careful with my back. By doing this, I am hoping I can avoid more serious issues later on.
One of the things I'd like to get is a foam roller. The heaviest intended use is to lay down on it length-wise. Several articles online and videos on YouTube have suggested getting a 36" foam roller for this purpose.
My main concern is what density I should be getting. I am a big guy (6'3", 200lbs/193cm, 93kg) and am debating between getting the OPTP Soft and Standard density rollers. Because I can't get quality products where I live, I need to ask a friend to bring one over from the US and so I need to get it right.
I'd appreciate any recommendations on which density to get for the intended use / my body weight.