Physical reality is full of life force. It washes through like a fast moving river. As this energy moves from one place to another, the various physical lifeforms absorb this abundant energy. If you are firmly rooted in the life force you will be more youthful, energetic, and just have an all around easier physical experience.
Meditation can help you tune into life force. It calms the mind and allows you to feel its subtle energy. With some conscious thought during mediation, you can coax extra life force into you and draw it up like a sponge.
Crystal Mediation is even better for absorbing life force as the crystal structures help align you to the life force's energy pattern.