Participants will be required to attend three sessions (isometric, isotonic, or walking) within a maximum of two weeks. The order in which the participant completes the sessions will be randomised.There will be a minimum of 48 hours between sessions. To account for potential time of day differences in terms of pain, all sessions will be performed within ±1 hour (e.g. if the first session is performed at 10 AM the remaining two sessions will be performed between 9 and 11 AM). After diagnosis, randomisation of the order of which the sessions will be performed, and have their pain during an aggravating activity examined (aggravating activities will be static stance, half squat or heel raise). Subsequently the participants will be instructed in performing either isotonic or isometric heel raise or walking, (determined according to the randomisation) by a physiotherapist.