Run for more than 30 minutes or 2km, play basketball for 40 minutes, play football for 40 minutes, play badminton 1 hour, do aerobics for 40 minutes, and swim continuously for 25 minutes.

Skipping rope, running, basketball, football, badminton, aerobics, swimming.

Everyone's standards are different. When your heart rate reaches 120, you have difficulty breathing and your saliva is sticky, which means that your limit has been reached.

Except for athletes, people can't go beyond the limit.

This time is strenuous exercise.