By day six, I had given up on my sister and was striking out on my own once again. It is possible to exercise with Lazy Bones if you catch her at the right time. If and when you figure out what this time is, please let me know. I have yet to piece that puzzle together. Most people do not enjoy exercising.
All people are different, and with that comes different levels of physical fitness.
It is nearly impossible to be on the exact level that someone else is at any given moment. When you are alone, you can set a pace comfortable for you. There are no outside pressures to worry about and no others to depend on. I have concluded it's the only way to go.