Easiest Way To Tell if Your Workout Is the Right Intensity To Burn Fat

In TODAY.com's Expert Tip of the Day, a trainer reveals the equipment-free hack to know you're exercising intensely enough.
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Ask the doctor: My cardiac tests came back clear but my resting heart rate is going up – Should I get more tests?

Question: I have had lots of cardiac tests lately which came back clear – but I notice that my resting heart rate is going up. I am in my 40s and female and I was wondering if I need to get more tests ...