What is the intensity range for the endurance energy zone?

The endurance energy zone is typically defined as an intensity range that is effective for building aerobic capacity and improving stamina. This zone allows for sustained activity that helps the body to utilize fat as a primary fuel source, enhancing overall endurance.

The intensity of 65-75% of maximal heart rate (MPH) aligns well with training aimed at developing endurance. It is within this range that individuals can maintain a relatively steady output without reaching the point of exhaustion, facilitating longer workout sessions that build cardiovascular endurance and efficiency.

In contrast, the other intensity ranges either fall below the optimal level needed for endurance training or exceed it, which could shift the focus more toward performance and anaerobic efforts rather than pure endurance development. This makes 65-75% MPH the correct choice for the endurance energy zone, as it strikes the right balance for improving endurance while remaining sustainable over longer periods.