Your brain at positive is 31% more productive than brain at negative, neutral or stress.

To condition a positive attitude, for 21 days,
1.Ponder over 3 new things that you are grateful for
2.Pen down 1 positive experience over every past 24 hours
3.Pen down 1 positive email (random acts of kindness)
4.Exercise
5.Self-meditation

http://www.ted.com/talks/shawn_achor_the_happy_secret_to_better_work#t-684723