Love the idea, although it is indeed quite similar to liftvault without the routine names.

Might be worth considering having a centralized repository of exercises with curated links to videos which demonstrate how to perform that exercise with proper form. Then when creating the routine, you select from that list of exercises. This allows for a bit of consistency and quality control so people aren't throwing in random exercises.

Might also help to have an upvote feature so garbage routines aren't given too much weight.

Great job!