This is another really great core exercise that forces all the muscles of your abs and back to stabilize you as you press a weight overhead. (verywellfit.com)
They test your balance One of the reasons that planks and side planks are such great core exercises is that they require you to engage your abs to the max in order to stay upright. (health.com)
The hanging leg raise is a great core exercise that works your whole abdominal area. (fitnessandpower.com)