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Summary: Focus strength training on the lower back and glute muscles by doing the plank core exercise on the forearms. Learn to do the forearms plank core exercise with tips from a certified fitness trainer in this free exercise video.
"This next functional core exercise is the plank on your forearms. Now this is a great exercise to really develop core strength, so we're focusing on the abdominal area, the lower back and the glutes, so in essence it's a really good total body conditioning exercise. So just come on down on the floor. Place your forearms about shoulder-width apart, extend your legs back. Pull that belly in, so you want to imagine that you're really drawing that navel in towards your spine. Put your feet together. Have a slight tuck of your pelvis area. Pull your shoulder blades back and down as though you're sliding your shoulder blades into your back pockets. Now the thing about the plank is that you want to imagine your body in a nice, straight line. Think about lengthening out through the crown of your head so that you're growing an inch in your posture. Now once you have this down you can modify or make it even harder, so take your legs out, out, in, in, then you really start to feel that in your triceps. Try to do this for about 30 seconds to a minute, and then breathe naturally. When you're finished lower your knees down and just rest. That is the plank on your forearms."
eHow Article: Core Exercises: Forearms Plank