Long before air or electric impacts were on the market we got the neighbor kid to hold the wrench on the bolt for a dime while we impacted the wrench end with a 2x4 of appropriate length for the task at hand.
Now that kids won't work for any reasonable amount of money, I've resorted to shimming the wrench on the bolt head with cereal box top cardboard when necessary and then impacting the wrench end with that old favorite 2x4. It hasn't failed me in 50 years.
My next venture into the unknown is trying duct tape around the bolt head for shim material when cereal box tops are at a premium.