Answer:
normative influence
Step-by-step explanation:
Normative influence -
It is one of the human behavior , where the person , atlers his or her thoughts and behaviour , randomly just by looking or observing it on some other person , is known as Normative influence .
It is a very dominant type of influence , where the person unknowingly copies or replicate the same task .
Normative influence , can also be in the form of thoughts , as the person too get influenced and other peoples thought and replicate them to their life .
Hence , Hammond did the same thing by replicating the stretching exercise done by his colleages .