I was doing chin ups from age 12 to age 48, but now in my 70s, I can only do one chin up.

My father installed a chin up bar in 1961.
I installed chin up bars in 1988, 2000, 2022, and 2022 [last one at my son's house]

https://www.amazon.com/ONETWOFIT-Mounted-Stable-Outdoor-Maximum/dp/B07SH6796G

[Linked Image]

how I mount them

[Linked Image from m.media-amazon.com]

how amazon bolts them to the wall

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps