Participants randomized to the intervention group will receive access to the Active Wait program, which includes remote, self-paced (asynchronous) education, exercise, and nutritional advice delivered via a web-based platform. The participants in the intervention group will have access to the program, in conjunction with health coaching.

Patients undertaking health coaching will be assigned a personal health coach who will provide support to increase their ability to self-manage through self- regulation principles of behaviour change. Health coaching sessions will be delivered remotely (via telephone or video conferencing) a maximum of 8-times during a 12-week intervention period. Sessions are limited to 1 hour, offering education, self-management strategies, barrier and facilitator identification, support and encouragement, goal setting, action planning and self-monitoring with the intention to facilitate positive and sustainable lifestyle and behaviour changes.

Patients in the active-comparator group will be given a link to the same Digital Toolkit. The digital toolkit is a 12-week non-contact programme titled Active Wait, which offers education, self-management techniques and an unsupervised strength programme. The website Active Wait can be accessed via the link: https://protect-au.mimecast.com/s/8\_5gCP7yRZiWn3q3FzwqnS?domain=sheffieldachesandpains.com/

The core belief in coaching is that people are resourceful and that the participant knows what is best for themselves. If the participants are assigned to the health coaching group, they will have access to a health coach with a physiotherapist background. Instead of offering physiotherapy advice, however, the health coaching will work with the participant to come up with ideas that work the best for them to manage their health and wellness to prepare for surgery, including addressing some difficulties the participant are facing when using the online resource.

Bowens Framework - acceptability (Perceived benefits) 7-point likert scale global rating of change (GROC) with -3 being worse, 0 being no change and 3 being better

Bowens Framework - acceptability (Perceived satisfaction). How satisfied were you with the overall information, level of support, and ease of use of the program? Measured on a numeric rating scale, where 0 means not satisfied, 10 means significant satisfaction.

Bowens Framework - acceptability, percentage of participants progressing from baseline, to midpoint and post-intervention assessments

Bowens Framework - acceptability, percentage of people discontinuing in both groups

Bowens Framework- practicality, measured by number, type and severity of adverse events

Bowens Framework - implementation, measured by the number of attended sessions (health coaching) number of days during the week using the active wait website

Bowens Framework - demand, measured by n number of recruitment per week.

height and weight aggregated to arrive at one reported value BMI, in units kg/m^2

Self efficacy questionnaire. Contains 8 items, each measured on a scale from 1-10. Higher score indicates greater self-efficacy.