1. A method of recording posture with an implantable device, the method comprising: monitoring a right posture signal from an implantable posture sensor in a subject, the right posture signal including a right lateral decubitus posture (LDP) signal; recording a right LDP record by recording the right LDP signal with a posture memory; monitoring a left posture signal from the implantable posture sensor, the left posture including a left LDP signal; recording a left LDP record by recording the left LDP signal with the posture memory; computing a first posture trend of the subject by periodically comparing the right LDP record and the left LDP record; comparing the first posture trend to a specified posture-based therapy for heart failure to determine whether the first posture trend is indicative of a change in wellness and automatically providing: a wellness indication of the change in wellness; and generating at least one alert indicative of non-compliance of the first posture trend with the specified posture-based therapy, wherein the at least one alert is one of a plurality of escalating alerts provided to the subject to promote compliance with the specified posture-based therapy, wherein the plurality of alerts are of different types that escalate in difficulty to ignore according to a degree of non-compliance with the specified posture-based therapy.