The relationship between exercise intensity and affective responses demystified: to crack the 40-year-old nut, replace the 40-year-old nutcracker!
Annals of Behavioral Medicine (2008) - Comment
pubmed: 18369689  doi: 10.1007/s12160-008-9025-z  issn: 1532-4796  issn: 0883-6612 

Panteleimon Ekkekakis, Eric E. Hall, Steven J. Petruzzello