Holding the standard plank for ten seconds or longer is useless according to Dr. Stuart McGill. Unfortunately, many people still try to do planks for time.
A better way to progress this core exercise? Make it harder. The cable plank press will help you take your core strength to the next level, and you'll even build some extra upper-body muscle.
How many Mondays have you been to the gym, anxiously awaiting your chest workout, only to find that you have to wait 45 minutes just to get on a bench? It seems that every guy in the gym trains his chest on Monday; it's a foregone conclusion.