Interval training works! It helped me tranform my body. Of course, we have to be safe whatever we do. The person who said "don't do it," I don't know what led to her injuries, but we do have to do whatever exercise properly. But intervals burn fat! And I like that!
Don't do it. Working with a gym owner/trainer tried doing this. I went from walking/hiking for miles every day to getting the worst leg cramps in less then a block after doing this for a few days. It took me over 3 years for the cramping when going on a walk to stop, I only did this for about a month.
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