It’s not just the number of hours we sit at a desk that determines the value we generate…

It’s the energy we bring to the hours we work. Human beings are designed to pulse rhythmically between spending and renewing energy. That’s how we operate at our best. Maintaining a steady reservoir of energy — physically, mentally, emotionally and even spiritually — requires refueling it intermittently.

See: How to Accomplish More by Doing Less by Tony Schwartz