Workout routines that don t deliver what you expect may be a waste of energy.
Most workout routines designed to improve your aerobic fitness involve exercising for 20 minutes or longer at a percentage of your maximum heart rate known as your training zone.
Quite apart from the fact that the formula traditionally used to calculate your maximum heart rate is extremely inaccurate, some workout routines can elevate your heart rate without having any effect on your cardiovascular fitness. In other words, it’s possible to raise your heart rate, keep it there for 20 minutes or more several times each week, and it won’t improve your fitness in the slightest.
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