Layout/straight double back
The double layout is an exceptionally and increasingly common skill in floor routines, largely because its F value provides a lot of bang for the effort compared to skills in the twisting or double Arabian realms. It’s also a link-in-the-chain kind of skill, in that proficiency with the DLO can lead to adding twists and upgrading to increasingly valuable skills. Other tumbling skill families start to peak out around F.
The double layout used to have a reputation as the go-to pass for veteran gymnasts to perform once they return after their fake-retirements, but now it’s just a pass for everyone because of that value boon.