Effectiveness of a Personalized In-home Telerehabilitation Program on Self-Care in Patients With Long COVID

The goal of this clinical trial is to evaluate whether a 12-week tele-rehabilitation programme with monitoring via a mobile app produces medium-term improvements in self-management, fatigue and quality of life in patients affected by persistent COVID. The main questions it aims to answer are: * Will a multimodal program (exercise with education) improve the self-management ability of patients with post-exertional malaise? * Does fatigue and quality of life will be improved in these patients? Researchers will compare an experimental breath program to a control standard care group to see if multimodal program works to treat post-exertion malaise. Participants will: * Follow-up 12 weeks online sessions: 1 weekly synchronous online session + 1 scheduled asynchronous session + educational resources * Daily use of the app: daily log, education and questions

Inclusion Criteria: * Post COVID-19 condition: individuals with a history of probable or confirmed SARS-CoV-2 infection, usually 3 months from the onset of COVID-19 with symptoms that last for at least 2 months and cannot be explained by an alternative diagnosis. Common symptoms include fatigue, shortness of breath, cognitive dysfunction * Between 18 and 75 years of age * Possibility of access and use of smartphone. * Ability to attend the clinic in person for an initial session. Exclusion Criteria: * Patients with a history of respiratory or cardiovascular diseases prior to COVID-19, other acute or chronic diseases that may interfere with the study * Pregnancy/breastfeeding * Those with contraindications to respiratory muscle training.