Answer:
What can get you there in eco style, pushed by your legs mile after mile?
Timid or weak people are said to not have these.
What is always coming but never arrives?
A person's greatest asset.
What has 4 fingers and a thumb, but is not living?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.