treadmill with baby question

Ava will never let me set her down.  I need to start working out.  Has anyone ever used the treadmill (walking) with the baby in a sling or baby bjorn?  Or is that too dangerous (probably a stupid question, huh?).   I know I can walk outside but the weather is getting pretty yucky and my sisters wedding is in 5 months.  Need to fit in dress...lol

I dont' think it's a stupid question at all. I was actually planning on walking on the treadmill with Adalyn in a sling, but my sling sucks! I think it's perfectly fine as long as you're walking at a reasonable pace and the sling or baby holder is very safe and secure. It would be just like walking outside with her in one to me.