Swiss balls are a lot of fun.

Most bench exercises work really well on one, such as dumbbell bench press, db flys, db shoulder press (just sit on the ball while doing them).

You can also do a lot of exercises that would normally be done on the ground, such as pushups (elevate your feet), bridges, russian twists, medicine ball throws, and crunches.

There are also plenty of exercises that are tough to do without a swiss ball, such as knee tucks and lateral rolls.

I challenge you to do a bulgarian split squat on a swiss ball though. I’ve never tried, but it sounds tough and now that I’ve thought of it I am going to have to try it tomorrow morning when I head to the gym.