Answer:
the standard of health, comfort, and happiness experienced by an individual or group.
It must be safe, and effective
It could mean that your muscles are being overworked. You could have also sprained something.
Results from the 2015–2016 National Health and Nutrition Examination Survey (NHANES), using measured heights and weights, indicate that an estimated 39.8% of U.S. adults aged 20 and over have obesity, including 7.6% with severe obesity, and another 31.8% are overweight.