Answer:
I suck.
What is easy to get into but hard to get out of?
I have two bodies joined together as one. When standing still I run and run.
I am a word with 5 letters. Bold are the first; true are the second; playful are the third; clever are the fourth; forceful are the fifth.
Weight in my belly trees on my back nails in my ribs feet I do lack.
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk