Hyperextension...had one though not enough used it so he binned it.
In regards to bbuilders, 70lb DB's and gym owners.
Its a savvy move. Bodybuilders train too long, make noisem sweat grunt, intimidate others (not een iuntentionally)
In the 2 hours they are there you might get 4x middle aged men doing half an hour buying 2 drinks and leaing. 4x the money...bbuilders gyms are very rare...a successful one is even rarer