Is Liz performing aerobic exercise if she can only run a few minutes before getting tired?

Aerobic exercise is characterized by sustained physical activity that raises your heart rate and encourages the body to utilize oxygen efficiently to produce energy over longer periods of time. If Liz can only run for a few minutes before feeling fatigued, it suggests that she may not be able to maintain a level of intensity that allows her to continuously supply her muscles with oxygen. This typically indicates that her activity is short and intense enough that it relies more on anaerobic energy systems, which do not require oxygen and are used during high-intensity efforts for short durations.

If an individual can only sustain an activity briefly before tiring, this often points to anaerobic exercise since it is performed at a higher intensity where the body struggles to meet its energy needs purely through aerobic pathways. Therefore, the conclusion that Liz's action does not qualify as aerobic exercise aligns with the understanding of the body's energy systems during physical activity.