The intensity of a physical activity will be reflected with the speed at which the activity is carried out or the magnitude of the effort required to perform an exercise.
A moderate physical activity requires moderate effort, which noticeably accelerates the heart rate, but you can usually carry on a conversation. For example walking. Instead vigorous physical activity is going to require a great deal of effort and causes rapid breathing and a substantial increase in heart rate. For example surfing, playing tennis, horseback riding, biking, dancing and swimming.
Relying on others... you are making this decision yourself, right? If thats not the answer, doesn't fit in with other content of assignment, the answer would be trusting your instincts. Hope this helps!
