Stones, kegs, and many other Strongman implements will challenge you and get you stronger.
One of our favorites is the 200lb Iron Mind sandbag aka The Humbler
Granted 200lb is not a lot on a barbell, but a 200lb sandbag is a monster to handle.
We’ve taken this beast in steps
1-gravity breakers=just lift it off the floor for an inch or two
2-sit back with it (similar to lapping an Atlas stone)
3-powerfully lift it to a full standing position
bonus=carry it for 50 to 100 feet
Not a lot of words needed for this, just hard work.