This exercise is good for your fingers as well as for warming 
up before you start playing.
First of all put your fingers in separate frets;
  for example: G——————————————————       Play the fist four notes. When you pass to A 
               D——————————————————       string and you play the other two notes (1,2)
               A——————————————1——2       try not to take your other fingers from the 3rd 
               E——1——2——3——4—————        and the 4th fret, which are in E string.
        When you move one finger make sure that your other fingers 
        are not being moved from the other frets.

The exercise:
G———————————————————————————————1—2—3—4——————————————————————————————————————————————————
D—————————————————————1—2—3—4———————————1—2—3—4——————————————————————————————————————————A————————————1—2—3—4——————————————————————————————1—2—3—4————————————————————————————————
E———1—2—3—4—————————————————————————————————————————————————1—2—3—4——————————————————————


                                       enjoy