Lyn, maybe you could find a used treadmill. Sometimes I think that a treadmill would be nice, but we have no place for one, unfortunately.
Regarding potty training, it's recently occurred to me that DS1 might be hanging on to his diapers due in part to a bit of jealousy towards his brother and insecurity as to his place in our hearts. So I try to give him more attention and let him know that he is loved very much, still. I, too, feel that at some point it will just "click" for him. He has actually said that he wants to wear underwear and pee in the potty like a big boy, but then he showed little interest afterwards. I'm just being patient with him.
I actually JUST got them both down for nap. They really fought it today.