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.
A training program doesn't have to be complicated to work. In fact, sometimes the most simplistic routines can be the most exhaustive and result-producing.
There are 3 ways to simulate growth: Inflict structural damage, increase neural activation, or prevent blood and oxygen from entering the muscle during a set. Few exercises do all three, but the constant tension alternate curl does.