Affect and exercise: positive affective expectations can increase post-exercise mood and exercise intentions
Annals of Behavioral Medicine (2015) - Comment
pubmed: 25248303  doi: 10.1007/s12160-014-9656-1  issn: 1532-4796  issn: 0883-6612 

Suzanne G. Helfer, Jon D. Elhai, Andrew L. Geers