SacralThe nine centersHuman Design

The sacral is the power source in Human Design: the one with continuous supply, defined in roughly seven people in ten. It governs not stamina but response — an immediate, pre-verbal answer to 'this or not'.

Filled means an inexhaustible supply that only opens on the right things. Open means you have no continuous energy of your own and borrow the room's, which makes it easy to overrun without noticing and collapse afterwards.

Running well, this is the cheapest mechanism in the chart: the right thing doesn't tire you, because it isn't expenditure — it wanted to move anyway. Blocked, the signal is specific: frustration, energy with nowhere to put it. It reports the same thing nearly every time — you agreed to something your body never nodded at. So the practical use isn't time management. It's asking yourself once a day whether you want to do this, and listening to the first second.