Amy,
I would go easy on the yard "work" with that Peg tube. Stick to the less physical cosmetic gardening like pulling weeds and pruning shrubs - preferably while sitting down or at least moving carefully. Leave the mowing, raking, & rock rolling

to your husband and kids - or just leave it until you can get them to do it. But, as I said in a previous post, gardening is so therapeutic for those of us who enjoy it. Fingers in the dirt, helping beautiful things to grow, and the results are so rewarding. It really helps me "get to real" and comforts me.
When I got my Peg tube, my RO's office gave me a tube-shaped very flexable kind of stretchable netting that fit around my waist/tummy area and held the tube from flopping around. It helped a lot. A little extra tape to hold it should also help. Just don't do anything that puts a strain on those abdominal muscles - no heavy lifting, etc. I don't know about the running. That's something I've never done, but I would get someone's professional or at least experienced advice before I tried it.
How old are your 4 kids? Young enough for you to work on Halloween costumes and decorations? Maybe you guys could try a "game night" over the weekend. My Grandson has started it in his family and they all really love it. He and his sister are 11 and 7. If you like cooking, maybe you could plan and prepare a really great dinner this weekend - maybe try out some new recipes or just some old favorites that you don't make too often.
Just a few ideas, but if I haven't helped yet, let me know. I've got a million of them.

Lani