Getting into the State: Breathing Exercises

At several points in the day, try simply closing your eyes and taking a deep breath.Turn your attention inward and remember whatever it is you need to, and as you let your breath out exhale all your tension and concerns. David Kundtz
Rebuilding yourself for Success can at times be emotionally stressful, in any case as you start succeeding you will certainly enter new unfamiliar areas. When this causes you anguish, you will find that deep breathing will bring you relief. Sometimes however you can feel unenergetic and demotivated deep-Breathing can help get yourself "into the state"
Just practice (discretely) pumping up your oxygen with rapid deep breaths, feel your energy levels rise and your mood improve.