After practice, the obligatory running of laps, ladder drillls,etc. my HS coach
would line us up on the end line... and would call out a name. That guy would have to go to the line for a 1 and 1. If he missed the first FT, we had to run two sprints, make the first and miss the 2nd, we ran 1 sprint.
Then another name was called...
With a team of 13 players, it could be rough after 7 or 8 guys had gone to the line.
What it did, was to teach us how to shoot FTs when we were very tired and our arms felt like logs.
I don't know why bad FT shooters won't take a jump shot rather than standing flat-footed at the FT line.