This is a great doubles routine that used by a lot of pro players.
– start on 40 if you finish 40 you go down 4 points. so 36 32 28 etc. the goal is to finish every number in a row. 40,36,32,28,24,20,16,12,8,4,2
– if you mis the finish with 3 darts you go all the way back to 40
– play this game for 10-15 minutes a day and bring your doubles to a next level