Final answer:
Tightening the back of the arms involves activating the triceps muscles and can be done through exercises like tricep extensions or dips. Focusing on maintaining proper form is important to prevent strain on the neck and target the intended muscles.
Step-by-step explanation:
The subject of this question relates to Health.
Tightening the back of the arms involves activating the triceps muscles. This can be done by performing exercises such as tricep extensions, tricep dips, or push-ups. Squeezing the back of the arms during these exercises can help increase muscle activation and strengthen the triceps.
Additionally, focusing on maintaining proper form, such as keeping the head in line with the spine, can help prevent strain on the neck and ensure the exercise targets the intended muscles.