Adding a nanosecond to your life by never climbing stairs
Remember high school physics? Because the force of gravity increases near the surface of the Earth, so does your acceleration which means exactly what youre thinking time slows down. Once again, this is very relevant to modern day society because at different altitudes clocks tick at different speeds. Also, remember that since the earth is rotating, someone standing near the equator is moving faster than someone on the north pole. Once again, their clock is ticking more slowly.