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Physical activity staging distribution: Establishing a heuristic using multiple studiesC. Nigg; L. Hellsten; G. Norman; L. Braun; R. Breger; P. Burbank; M. Coday; D. Elliot; C. Garber; M. Greaney; S. Keteyian; F. Lees; C. Matthews; E. Moe; B. Resnick; D. Riebe; J. Rossi; D. Toobert; T. Wang; G. Welk; G. Williams · 2005