Swimmers: continue your dry land rotator cuff training throughout the entire season.
If you have a patient with a fusion, you can get some nice core muscle activation with neutral positioning and resisted limb movements.
For best exercise outcomes, hire a personal trainer.
Not surprisingly, double leg lowering isn’t very responsive for testing abdominal strength. But a lower abdominal progression is better. But to improve this strength the most, general exercises are better than specific ones.