Funny Riddles

Question: What chair can move

Question: Weight in my stomach,trees on my back,nails in my ribs,it's feet I lack.What am I?

Question: What sport starts with a T, has four letters, and is played around the world?

Question: When do you go at red, but stop at green?

Question: 100 feet in the air, yet its back is on the ground.

What is it?