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How much cardio is too much cardio? It’s a question of personal interest. Not that I’ve been hitting the treadmill every day. But, I evidently overdid it on the eliptical machine a couple weeks back.

Back being the operative word.

My lower back has been tense and sore ever since my cardio routine of a couple Saturdays ago. I attribute it to maybe too light on the stretching and a little too much on what was a new machine for me.

Anyway, back to the initial question.

A reader asks MSNBC Contributing Editor Jacqueline Stenson how much is too much.