This is an excellent upper body strength & core exercise to add in your routine.
From a rehab point of view, we use this exercise in the advanced stages of athlete’s return from shoulder stabilisation/dislocation type surgery.
The push-up plank position at the start of the movement is a closed kinetic chain exercise meaning the hands are contact with a surface during a movement. The fixed position of the hands emphasizes co-contraction of the shoulder muscles for stabilisation. This activation is crucial for any athlete who is returning from these surgeries.
The instability of the gym ball challenges the core even more.
Start with just the “ROLL IN/TUCK” movement and when progress to the “PRESSUP” movement when able.