Isometric adduction of the legs while seated

Individual work

Sit upright on the floor with your arms supporting your upper body, which is bent slightly backwards. Bend your legs and place them on the floor, place a softball between your knees and press your legs/knees together. Release and resume the tension from time to time.

Lighten:
Softer ball, exert less pressure.

Harden:
Harder ball, exert more pressure

1 volleyball / foam ball / softball / basketball / football