From YogaJournal.com:
Power Retreat: To take yourself off the grid, try this practice. First, let go. Disconnect from all of your carbon-creating activities.
Commit: Choose a full-day or half-day retreat.
Pull the Plug: Unplug all appliances except your refrigerator.
Go Tech Free: Power down your computer, cell phone, and television.
Park It: Keep your car parked and walk, bike, or ride the bus if you want to go somewhere.Then, tune in to your surroundings and your personal energy.
Illumine: Try oil lamps, soy or beeswax candles, or natural light.
Connect: Spend time connecting with friends and family.
Breathe: Practice asana and meditation.
Reflect: Read something that nourishes you.
Be Wild: To outside for a walk, bike ride, or more-playful activities.
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