Which type of exercise is considered anaerobic?

Anaerobic exercise is characterized by short bursts of intense activity where the body relies on energy sources that do not require oxygen. This type of exercise predominantly uses energy pathways that involve creatine phosphate and glycogen, and it typically occurs during activities that last a short duration, usually under two minutes.

Weight lifting fits this definition perfectly as it involves performing exercises with heavy weights for short periods of time. The energy required during weight lifting comes from anaerobic metabolism, which enables muscles to perform at high intensity without the need for oxygen immediately. The body utilizes stored ATP and phosphocreatine to fuel these quick, powerful movements, making it a prime example of anaerobic exercise.

In contrast, activities like running, swimming, and cycling are typically sustained over longer durations and engage aerobic metabolism, where oxygen is used to generate energy for the muscles. While these activities can include short bursts of speed or intensity, their primary energy systems involve aerobic pathways, distinguishing them from anaerobic exercises.