The investigators are proposing an experiment to help Humana investigate when to launch programs or send messages that are designed to improve customers' engagement. The investigators' past research has shown that certain life events and calendar events (e.g., a job change, a birthday, a holiday, Monday) feel like a "fresh start" to people and have the potential to motivate them to begin pursuing their health goals (e.g., exercising, starting a diet, quitting smoking).

The investigators are proposing an experiment to help Humana investigate when to launch programs or send messages that are designed to improve customers' engagement. The investigators' past research has shown that certain life events and calendar events (e.g., a job change, a birthday, a holiday, Monday) feel like a "fresh start" to people and have the potential to motivate them to begin pursuing their health goals (e.g., exercising, starting a diet, quitting smoking). In this experiment, the investigators will test (a) whether Humana can increase the effectiveness of its messages by sending them to customers around fresh starts moments and (b) whether highlighting a recent fresh start event in Humana's messages can further increase customer engagement.

Inclusion Criteria:

• customers of our insurance company partner

Exclusion Criteria:

• none