Sleep is the highest-return health behaviour there is, and everything else — exercise, diet, self-control — rests on it.

Drawn from what Bryan Johnson said

What this subject means

health and fitness The body as something you decide about: sleep, exercise, drugs of every legality, and how far optimising it is worth taking.

What Bryan Johnson actually said

Do you hold this korrent?Do you also believe this?

Shared subject first, then similar wording. They may agree or disagree.