Walking epidural vs regular epidural

Jessica
What's the difference between the walkin epidural and the regular one ? This is my 3rd pregnancy , the other two I have only had the regular one and I don't like how it leaves the  bottom half of my body numb for a while even after labor . I don't want to walk around I just want to be able to move my legs and not be so numb . (Hope that makes sense) if my hospital allows it , can anyone she's some light on if it's te better of the two to go with ? 
   I never knew they had more than one way to get an epidural . This would really help a lot . 
   My only question is , with the regular epidural they leave the epidural In to give off te pain reliever thru out the whole process . Do they do it with the walking one too ? Or is that a shot ? 
 
Thank you for the feedback . Sorry it's long .