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There is a safer and more effective exercise you can do to strengthen your core â the plank exercise. The plank is an isometric exercise that helps build endurance in your entire core â rectus abdominus, obliques, lower back and stabilizing muscles. It is a powerful but simple exercise that you can do at home. Letâs discuss how the plank exercise is done and why itâs so effective.
If you don't have the core strength yet to do a regular plank, you can build up to it by doing a bent-knee plank. If you can hold a plank for more than two minutes with ease, you can move on to these tougher variations.1  Lift one leg up. 2  By simply raising one leg in the air, you dramatically increase the demand on your core to fight your body's natural urge to rotate. 3  Lift one arm up.4  Again, your body will want to fall to one side.f you don't have the core strength yet to do a regular plank, you can build up to it by doing a bent-knee plank. If you can hold a plank for more than two minutes with ease, you can move on to these tougher variations.