5 claims in “health, psychology”
The benefits of improved hearing become increasingly valuable as people age.
Even for people who feel confident about their focus, learning ability, and mood, exercise could still improve all these areas measurably, analogous to how discovering higher-quality headphones reveals how poor one's previous setup was.
The speaker attempted to use modafinil (a pharmaceutical 'productivity pill' sometimes compared to NZT from the movie 'Limitless') to treat suspected ADHD and productivity issues but found no striking contrast in subjective experience; he would only notice productivity gains looking back on the day, and discontinued use after a few weeks due to discomfort relying on a substance.
After establishing a consistent daily morning exercise habit, the speaker now regularly experiences moments looking back on the day thinking 'Wow I really got a lot done,' but when skipping exercise, the effect is replaced by diminished productivity—'like I've put my shitty old headphones back on.'
Warren Buffett is a good example of someone with a positive attitude and good health despite a poor diet (high sugar, junk food), because his overall optimistic outlook and lack of toxic behaviors (no smoking, no heavy drinking) support health.