Toes to bar is a gruelling core conditioning exercise. This exercise hits every fibre of your core and is definitely recommended for intermediate to advanced fitness levels.
This is an intermediate core conditioning exercise. It is the next progression once you are able to do strict knees to elbows.
The knees to elbows exercise is one of the most challenging and one of the most effective core exercises you can do.
The hanging knee raise is an intermediate core exercise that targets the upper and lower abs.