Moving more. I need to do it.

Walking is great but I feel like I need to do more than just chase after my kids all day. I'm struggling to find the time and place to be able to do that. I have dvds etc but getting through one without interruption is very rare, if not impossible. Every 2 minutes one kid or another needs something. It's getting too cold to send them outside to play now. I realize i'm finding excuses not to do it but I know if I do I will feel better. Why am I sometimes my own worst enemy lol?