Becky - Why can't you work out with both kids? I wear one and put the other in a stroller, it gets us all out of the house and my kids love to go for walks. In the summer I'll take them to the park, but for now it's just around the neighborhood. It might not be running, but it's a decent workout and keeps me moving.
Because I want to run and don't want to give Levi shaken baby syndrome.