Table 2.

Working definitions of key physical activity message content and delivery concepts

	Working definition
Message Content
Type of information	The nature or purpose of information included in the message. Messages identified in the literature can generally be grouped into three broad categories: ‘how much and what type’ information (such as physical activity guidelines), ‘why’ information (such as benefits of physical activity), and ‘how to’ information (practical and supportive information).
Use of gain- or loss- framing [10]	The use of framing a message to highlight either the benefits of taking part in physical activity or the consequences of not taking part.
Tailoring [30]	Information based on individual user data (e.g. specific feedback on pre-established goals such as step counts)
Targeting [30]	Information designed to be relevant to a specific group (e.g. inactive individuals or diabetics)
Personalisation [30]	The use of static, user-specific information in a message (e.g. name or home address).
Message Delivery
Media or mode of delivery	The type of media through which the message is being relayed, for example, emails, posters or radio adverts.
Provider or source	The provider or source of the message, for example, GP, the media, or friends and family.
Frequency and dose	How often the message is delivered and for how long, for example, emails sent 3 times a week for 4 weeks.