The following is a list of attributes PushPress passes over to Mailchimp when data is updated. There is also name and address fields not listed below, I omitted those because its pretty obvious.
Member List (main default list)
Is Lead : [0 or 1] 0 means they are not a lead. 1 means they are currently in the lead funnel.
Lead Created : Date person was first entered into the lead system.
Lead Status : [New Lead, Attempted, Contacted, In Discussion, Converted, Disqualified] Lead funnel segment the person is in.
Is Member : [0 or 1] Set to 1 if person has any active plan with the attribute 'Are People Who Buy This A Member' set to YES.
Member Status : [active, inactive] This will reflect if they have any active plan or not. If they are set to Pending Cancel or Cancel it will change this to inactive.
Member Since : Date first plan was activated.
Last Checkin : Last time person checked in to gym.
Last Billing : Last time person was billed for a Plan.
Cancelled Date : Date the most recent Plan was cancelled for this person.
Current Plan : Most recent Plan activated for this person.
Number of Checkins : Total number of check-in's aggregated for all Plans.
Assigned To : If you assign a person to a Staff Member.
Member Rating : Default Mailchimp.
Last Changed : Default Mailchimp.
Date Added : Default Mailchimp.