Speaking of, split boards break the keys into two separate parts you can position individually. You can put them shoulder distance apart, bring them closer together or angle them as much as feels comfortable. You can also put your mouse between the halves, which may feel like an easier trip for your cursor hand and could potentially help with conditions like repetitive strain injuries (RSI). Personally, I like being able to put my current snack between the two parts. I've also found that pairing a split keyboard with a good ergonomic mouse has helped me even more, particularly a vertical mouse.
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Research has found that people with back pain, particularly lower back pain, tend to sleep more comfortably on mattresses that hover around the medium-firm level, as opposed to beds that are the firmest of firm. Your bed should be supportive to your spine and body, but not so firm that you’re uncomfortable.