If you have a mark, then you have sensitive skin, if not you don't but no one is weak or strong, just consider yourself STRONG!!
Sequential designs are developmental research designs that include elements of both cross-sectional and longitudinal studies; they are configured in ways to address confounds between age, cohort, and time of measurement.
The scenario is an example of a fight or flight response.
Muscle and body fat do not play a role in BMI scales; age and gender however do play a role.
