Try and talk to him about it or get an adult and let them know you are concerned?
Individuals should participate in Aerobic exercises to increase cardiovascular endurance. (There's more exercises than just running that can increase your cardiovascular endurance, aerobic is more of a group of activities that do such)
Answer:
you should not interupt or respond to anything in a condescending way
to demonstrate active listening nod your head to confirm you got the point when they pause add on to the conversation about their topic not changing the topic to talk about something else
Not enough detail.
One way is the verbal Rating of perceived exertion scale 6-20
Another is heart rate range compared to their Max heart rate 220-age
