How do you find out your max heart rate so you can do cardio accordingly?

mrgq questioned:

In my other inquiry the other day in this vicinity effective uncommon muscle groups, someone told me including the intention of as I do cardio I should run at 75-80% of my max sensitivity rank, if not I won’t be burning stout but muscle also. I don’t want to burn the muscle, but do the treadmills at the gym trade Trade show your max sensitivity rank? Becasue at that time you may maybe adjust your run to be in this vicinity 75-80% of it, aptly?
I usually run 3-4 miles three era a week. it takes in this vicinity 30 summary. Is this ok?

How much cardio exercise should i do daily if i want to lose 30% of my body weight?

misssophia299 questioned:

I now do a small consequence normal including the intention of facility the huge muscle groups as well. I admit I should change my exercises each 6 weeks or so, but I am unsure in this vicinity how greatly cardio is excellent for my wieght loss goals.