NCAA wouldn't let RR do what it takes to get players to make FTs.
On my HS team, we shot FTs at the end of practice (We always practiced 1.5 - 2 hours on non-game days.) AFTER we'd do our daily, tongue-dragging, end-of-practice running.
We'd all (16 guys on the team) line up on the end line.
1st guy went to the stripe for a 1-and-1. For each miss, the team had to run a full court sprint (down and back) for each miss. Missing the front end equaled two misses. Just like a game, our arms were jello, If we tried to rest at the stripe and went past the 10-second count (just like the count in a game), that was considered a missed FT. Oh, and if the coach didn't think we were sprinting, we had to run a "makeup sprint". Of course, during half-time of one game, our coach made us stay on the floor and practice our offense because he didn't like how we were executing it. It was embarrassing, but we learned a lesson. No subsequent lesson was needed.)
Repeat the scenario for each and every player.
We quickly learned that we'd better be shooting FTs before practice, after practice, at home, etc.
Side note: Not making FTs is why I'll never consider Shaquille O'Neal to be a Top-50 All-Time NBA player. There is NO excuse for any NBA player to shoot less than 80% on FTs ! None ! (He shot 52.7% on 11,252 FT attempts. 10th worst FT shooter in NBA history. Pitiful !)
Likewise, there's NO excuse for a D1 college player to shoot less than 70%. I'd be embarrassed to fail at such an important part of the game.