It’s a new year and a new decade, and the question I have heard the most from new exercisers is, “How high should my heart rate be while exercising?”

Recently an older relative had the chance to sit in on my Friday ‘Strength Train Together’ class, which is a total body workout with plates and barbells. I warned her that the music would be loud, and probably not the type of music she would like. After all, she is about 25-plus years older …