Rule · how much
Commit for a longer stretch
Choose a longer commitment period, e.g. a 20-week rather than an 8-week contract.

Studies (1)
Paper
A 20-week starting choice led to more good exercise weeks than 8 weeksTestedHelpedPeople first shown a 20-week contract had more good exercise weeks than those shown 8 weeks: about 4, against 3.
Large randomised trial of 8,809 adults who set up an online exercise contract · vs people first shown an 8-week contract · they rated themselves · ⚠ not yet checked by other scientists; summary claims more than the results show; numbers unreliable

