Heart rate ok ?

When I'm at gym I do 30 mins of elliptical at level 3 and 20 mins of treadmill at a 5% incline. This I find for me is just the right intensity, and over the last 3 weeks I have stepped it up gradually....(started at level 1 elliptical and 0% incline treadmill)

I've found that my heart rate for each is between 150 - 160 bpm. Is that a good heart rate for cardio or should I aim to be getting my heart rate up higher ?

Any advice greatly received

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