Gorillas are on average six to eight times stronger than an Olympic weightlifter, and many of those weightlifters have lifted over twice (and sometimes over three times) their own body weight, so you can imagine the strength of a 400-lb gorilla.
If you know one that's available next spring when I start remodling the parlor, let me know. I'm not looking forward to moving the piano.
Yes... I know gorillas in the parlor are inappropriate, but it's remodling.
/johnny