What comes to mind immediately is the wind (air) moves but can't run or walk.
you
Walk or run
you cant actually walk on any liquid but you can kind of run across custard if that counts?
they walk run skip .....
they walk and run with four legs
walk run and swim
It can walk, run and fly.
A river
Faster then when you walk. With speed I would think.
They walk or run.
No you cant. Your blood will run to your head and you will injure yourself
they can walk, run, or they can crawl