Fitness program: 5 steps to get started – Mayo Clinic
https://www.mayoclinic.org/healthy-lifestyle/fitness/in-depth/fitness/art-20048269
https://www.mayoclinic.org/healthy-lifestyle/fitness/in-depth/fitness/art-20048269
https://www.lifestyleasia.com/sg/living/wellness/guide-to-easing-back-into-gyms-after-long-break/
https://www.self.com/story/heres-exactly-how-to-ease-back-into-working-out