The chanting isn't meant to add to your life force, it just helps the earth prepare to receive your life force. Experiencing you can be quite a jolt, you know, and it's important to be sure the earth is up to it. Trying to resuscitate an entire planet is not fun. Generally it involves having to sacrifice a large number of kings, and kings aren't exactly abundant these days. Also, they often seem ambivalent about participating.
*Druids remove Freckles' clown shoes* Apparently your bare feet are helping the earth get to know you better.