Books! I do not have a TV. But, I derive much of my self entertainment and education from books (and I have many). Sometimes I use my 20-lb. ancient dictionary while I do Russian twists, step ups, lunges, et cetera. Other times I use my two 8-lb. modern dictionaries as dumbbell alternatives. A new idea that came to my attention was to fill tote bags with books and hang them off the ends of a household broom for weighted squats, as well as other leg and booty work.
Inversions! For upper body exercises, I do vertical push ups with my feet against the wall for stability. This is a great arm and shoulder challenge for those of us who have not yet accomplished the handstand.
Logs! My fiancé and I found various sized parts of trees that had been cut and I incorporated them into our routine. One of my favorites was dead lifting a particularly heavy green log. The more wet the wood, the heavier, the better!
Boxes of stuff! You can fill different sized boxes or totes with a variety of heavy objects and hold them in your arms during leg and some ab routines. You just have to see what’s possible.
Pets! One of my favorite methods from social media: seeing fitspirational folks use their pets while they workout. They just pick up their dog for some squats-it just depends on what your furry friend can handle! On a side note, when I was a kid growing up on the farm, I would carry newborn calves up from the pasture to the barn every summer, about half a mile, and would do lunges on the way. Some calves were more cooperative than others: sometimes it was more of an upper body workout just to keep them on my shoulders while they were kicking and wiggling!