If you're not having any pain, then intervals aren't an issue. I know I could do them when I was well over 300 pounds. However, you do have to watch out for joint pain and such. I know that when I went back to exercising (on the track to losing weight again) I had a tendency to overdo it. I ignored the dull ache each night for quite a while. I'm notoriously bad for not listening to my body. So, along the line of 'do what I say, not what I do' just be careful. Especially if/when you get onto the weights. I've managed (touch wood) to not do anything much more than a light (nothing a couple of days of rest didn't take care of) pulled muscle here and there, which I'm so happy about.
So, welcome, and best of luck!
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