Action
Go to the gym
Gym attendance.

Studies (2)
Paper
Weekly reminder emails got gym members to go more oftenUsedHelpedMembers who got short weekly reminder emails went to the gym about 13% more often than members who got none.
Large randomised trial of 2,463 members of a gym in Sweden · vs members who got no emails · behaviour was recorded
Paper
Reminder emails got students who seldom used the gym to go more oftenUsedMixedRare gym users went about 2 more times a month with email reminders than without, but the gain faded.
Randomised trial of 247 students at a university gym in Italy · vs students who got no reminder emails · behaviour was recorded · ⚠ unpublished working paper; numbers unreliable; randomisation method not described
