What is used to measure when the cardiovascular system is receiving the most benefit from exercise without working too hard?

I think the appropriate response is Target Heart Rate. It is prescribed that you practice inside 55 to 85 percent of your most extreme heart rate for no less than 20 to 30 minutes to get the best outcomes from vigorous exercise. The MHR (generally figured as 220 less your age) is the furthest reaches of what your cardiovascular framework can deal with amid physical movement.

It's cell theory. easy name i would think.

Where are the options?