I started teaching aerobics in 1983. The classes were approximately 20-30 minute of
mostly high-intensity exercise. Students
performed the same type of exercise several times a week without variation and as
a result injuries were quite frequent. Then, circa 1985, the low-intensity era
began and injuries were reduced, but many people became more prone to weight
gain due to a decrease in caloric burn.
Now the fitness industry has evolved full circle. We’re back to high-intensity exercise! It burns more calories in a shorter time and
you don’t have to exercise as long. But,
we need to remember the high injury rates of the 1980s. It is good to push yourself occasionally
throughout your cardiovascular workout.
Doing so will increase your aerobic capacity - your heart becomes
stronger (it’s a muscle) - exercise that left you out of breath a few weeks ago
is now doable!
So, what about lower-intensity exercise? High-intensity workouts should preferably be
performed only two to three times per week - your body needs time to recover
from this type of workout. The harder
the exercise the more recovery time needed.
This doesn’t mean you sit on the couch during recovery days, but lower
the intensity of your workouts. Lower
intensity workouts will still burn calories, but won't leave you out of breath.
Remember, you will burn the same amount of calories walking three miles as
running three miles…it will just take longer.