Table 1.

Summary of measures

	Type of outcome	Measure	Timeline
Steps per day	Primary outcome	Fitbit Charge 4	Daily across 8 weeks
Physical activity	Primary outcome	IPAQ short version (Craig et al., 2003)	Pretest, Posttest, Follow-up
Self-control	Primary outcome	BSCS (Tangney, Baumeister, & Boone, 2004)	Pretest, End of each week (weeks 1–7), Posttest, Follow-up
Big Five personality traits	Secondary outcome	BFI-2 (Soto & John, 2017)	Pretest, Posttest, Follow-up
Exercise self-efficacy	Secondary outcome	(Neupert, Lachman, & Whitbourne, 2009)	Pretest, Posttest, Follow-up
Satisfaction with life	Secondary outcome	SWLS (Diener et al., 1985)	Pretest, Posttest, Follow-up
Sense of control	Secondary outcome	(Lachman & Weaver, 1998)	Pretest, Posttest, Follow-up
Cognitive performance	Secondary outcome	Stop & Go Switch Task / Backward Digit Span Task / Immediate Word List Recall (Lachman et al., 2014)	Pretest, Posttest, Follow-up
Demographics	Covariate		Pretest
Self-reported functional status	Covariate	SF-36 (Ware & Sherbourne, 1992)	Pretest
Self-reported health status	Covariate	GHQ-12 (Goldberg & Hillier, 1979)	Pretest
Smoking status	Covariate		Posttest
Fitbit on dominant vs. non-dominant wrist	Covariate		Posttest