What is MAS?
Maximum aerobic speed (MAS) relates to aerobic performance (VO2max) and forms part of the process for developing aerobic capacity and is expressed in meters/second (m/sec).

What should you know about your MAS?
A school of thought suggests that to improve VO2max the training session should accumulate as much time at or as close to VO2max as possible. This is often problematic with continuous type running, cycling, rowing and swimming as it is difficult to maintain intensity sufficient enough to stress the cardiovascular system for prolonged periods.

Interval type training for the aerobic system can potentially overcome this problem as it allows sufficient stress at the VO2max level while allowing adequate recovery for repeated efforts therefore resulting in more time at VO2max.