People who improve self-regulation in one sphere (for example regular training), becomes better at self-regulating in other spheres (for example: smoked fewer cigarettes, drank less alcohol and caffeine, watched less television).

Baumeister RF1, Gailliot M, DeWall CN, Oaten M.; “Self-regulation and personality: how interventions increase regulatory success, and how depletion moderates the effects of traits on behavior.“; J Pers. 2006 Dec;74(6):1773-801