if you have a warehouse ..
anything inside can be your warehouse gym lifter ..
you dont need to buy anything fancy ..

my company have alot foreign worker ..
and they use cement to build up their own dumbell barbell ..
modify chair to do sit up ..
anyplace in warehouse can do pull up , and they prefer to hand with our backhoe machine .. and yes .. backhoe machine back big tyre ..

too much thing in warehouse that we can use to weight lifting ..

imagine how army workout ? they dont bring anything with them anywhere ..

they just make use of everything around them to do the weight lifting ..