Should I do core on upper or lower day?

In an upper/lower split, ab workouts can be incorporated into either the upper body or lower body training days, depending on your personal preference and goals.

5 Upper Ab Workouts

1. Up-and-Down Planks. According to Robles, planks are one of the best upper ab workouts. ...

2. Bear Hold

3. Crunches

4. Bicycle Crunches

5. Hollow Body Hold

5 round of 1 min each.....Can you press through?