How to use it
People move when it's necessary or rewarding, so make it rewarding: a training buddy at a set time, a group, a promise you'd hate to break, play, dance, a game.
How sure we are
S Evidence: strong. Large trials or many studies, pointing the same way.
P Evidence: promising. Good studies, but small or few. Use it and keep checking.
Sources
Group-based exercise beat training at home alone for adherence (Burke et al. 2006, meta-analysis) · commitment contracts helped (Royer et al. 2015; Giné, Karlan & Zinman 2010, 🟡) · Lieberman (🟠).
Not medical, legal or financial advice.