The overarching aim is to improve cardiometabolic health and promote healthy ageing by supporting adults to adopt favourable lifestyle patterns identified through our observational research. The trial will recruit n=600 to be involved in Phase I (referred to as the "Optimisation Phase") of a two-phase project (Phase II trial registration will be submitted separately). All participants will complete a baseline study visit where, after consent taking, will complete a baseline questionnaire, receive a smartwatch each and additional wearables if applicable, and download the study app for the receiving and testing of interventions and completion of short form surveys. Participants will be involved in the continual evaluation and optimisation of ecological momentary interventions (EMIs) in adaptive, factorial, micro-randomised trials over 12 months. Consenting participants may also be contacted to participate in interviews to be involved in the co-design of interventions, or to provide insights to the feasibility and process evaluation of the trial.