 The next exercise here is going to be called the dead bug exercise. It's really, really good at engaging our core while we're moving our limbs. That way we can train our body to stabilize here while our limbs are moving. Hi everyone, this is Dr. Nathan Cimeno, coming at you from the Southern California University of Health Sciences. I'm one of the full-time faculty members on campus. This is a great exercise to engage our core and teach our body how to move our limbs at the same time. We're going to start out here with the feet flat on the table, the knees bent, and then both hands are going to come up about the level of the shoulders right here, about 90 degrees, palms facing each other here. Now we're going to train our body to move the arms. One arm's going to stay perfectly still, the other arm's going to move back so that our arms line up with our ear. We're going to move back here overhead. Do it. Notice this thumb's kind of pointing straight down to the ground. He's moving in a nice straight line coming back to the top. And bring it back. Make sure the arms stay nice and even. We don't want them drifting apart or moving around. They're going to stay nice and parallel to each other. Let's get the legs involved here. We're going to start with a very simple movement. All I want them to do is keep this knee bent and we're going to actually start here at about 90 degrees at the knee. Keep that 90 degree angle at the knee and I want you to bring this knee up right about to where my arm is here, about 90 degrees of hip flexion. We have this sort of 90 degree angle here at the knee and the hip. And if we're really advanced, we can alternate the arms. I want you to tap this heel down to the floor. Bring this arm back overhead. Good. Now bring them back to the top. Excellent. This heel down, this arm up to the head. Okay. And now his core is really working strong here to try to make change the stable position as the arms and legs are moving on the opposite side. This is going to be really good for most people to help train their core musculature, which is not just the belly, not just the sides, but the back as well and help protect that spine. The real common ways that people can injure their back, a lot of people are working at their desk at home, they're not really getting up, they're not really moving as much. So a lot of the core musculature gets really deconditioned and not used to stabilizing the spine. So something as simple as bending over to pick up a lightweight object, when you're bending at your back, you're not really bending up the knees. Real easy to strain some of the tissues around the back and cause an injury that way.