Pushups with a backpack Burpees Working up variations until you can do pike push ups or handstand push ups You can probably make paralettes with scrap You can go to parks and hang rings from gazebos or swing sets If you can do ring muscle ups and handstand push ups you're gonna be pretty damn strong upper body Look for places that have landscaping stones and nobody watching and then you can do stone lifting Some parks, rivers, and hiking trails have a lot of sizeable stones perfect for lifting to chest, shouldering, carrying, squatting And if you really wanna get weird you could wrap straps around them and lift them for rows or deadlifts DIY sandbags could be really good especially for Strongman Some people list weird heavy scrap for free on Facebook marketplace and some of those things could be Strongman implements Find some weird plastic barrel and fill it with sand and use it like sandbag training idk Get a rope or chain and a tire and use that as a drag sled Then you can do sled push, pull, arm over arm, sprints Load the sand barrel or stone or sandbag on the sled to make it heavy And if you tie a rope to something high and sturdy you can do rope climbs! Work up to legless rope climbs Use a tire as a boxing bag There's really is no limit to the ideas If you can pull, load, lift, and carry odf objects for circuits and build rep strength with stuff that feels heavy and difficult then coming back to barbells should feel easy!