 Hey people on the YouTubes. What's up? Just got done with my workout tonight. Just quick 20 minutes one minute on one minute off bike intervals nice way to kind of decompress from the entire day and Just get sweating get some brain-derived neurotrophic factor release get some vaso endothelial growth factor released Good for the brain Got a little bit more work to do before the day is up. So One thing I did want to touch on is I got this question so I put up a video the other day of a half kneeling band pulldown I'll link to that below sometimes soon, but The half kneeling band pulldown is a really good exercise Just for you know Maintaining good position Teaching your body what good position is you can even throw some breaths in there and figure out how to breathe in that kind of weird position Half kneeling having one leg up and one leg down or one knee up and one knee down is really good for translating what you're doing into the gym into your daily routines, so Having one leg up and one leg down is good to emulate walking or a gait as we might say Mike the question that I got on the video though and hence why we're talking about physics today is Why don't you like? Bending the arms when you do your half kneeling stuff. So basically what I queued was you had this band over here And you keep your arms straight and pull down just slightly you don't pull all the way down But you also don't bend your arms and pull it in so it's not like a it's not like a lat pull down kind of pole It's not like a row kind of pole It's more of a Straight arm pull down kind of thing like a strict lat exercise And the question was why are you doing that when why don't you want to pull all the way down? Well? the idea behind that is physics-based so I Can keep your arms longer to increase the amount of stress that I put on your shoulder extensors or you're really specifically your lats and your long head of triceps break II It's nice because I don't need a whole lot of band tension all I need you to focus on is keeping your arms Really really straight and pretty long. I don't need you to over overreach or anything for this one as you pull down, but Let's go. Let's talk about physics. Hey Let me get a card for you. So The basic mechanics of how any joint moves is it moves around an axis So you have this axis going through the paper, right? Just like this thing might Through the paper. So this is the axis or this is the axis coming straight away from the camera and Then what happens is? Let's say the best example here is I have a an upper arm a brachium here And then I have an elbow which is my axis There and then I have a lower arm. Let's make that upper arm a little bit bigger. I have a lower arm It's a little bit skinnier And then I have a hand Okay, and Then we're gonna find another color. So Best example of all time is always the bicep because the bicep is easy one to understand. So Bicep comes down and it attaches Really close to the elbow joint, but it's a little bit away from it and then when So so muscle contractions, right? You can you can shorten or you can lengthen or you can stay the same length You could be concentrically contracting or essentially in contracting or isometrically contracting either way You're producing some amount of force No matter what like the length change doesn't matter You're still producing force and you're still producing it in the same way And that is to in the in the shortening direction of the muscles. So if the Biceps contracts it's like it's pulling this This right arrow upward and it's attached to The lower arm there So it's pulling the lower arm upward if it pulls the lower arm upward Considering that the the axis right there in the middle the elbow joint has it fixed. So we're fixed right here We're not moving the elbow. We're moving the bone attached to the elbow So what happens? Let's see if I can do this hold on what happens is This pulls up this way and it kind of makes this little angle. Oh, this is hard Yes, so it kind of makes this little angle you see that and if we were to Draw that on the other side We could even say it's going that way So as I look at this paper, I say, okay, well when I'm looking at this Let's say this is our right arm and I'm looking at the outside of the arm We can say that this is moving my elbow joint Into flexion we could say this is moving my elbow joint counterclockwise Pam flexion because I'm decreasing the angle of the elbow joint counterclockwise because I'm going counterclockwise based on how I'm looking So that's basic physics. So there's there's two things that it's it's important to distinguish So muscles produce force But torque is what moves us Okay, so muscles shorten in a direction in a in a one linear direction But because that everything acts about an axis everything acts about a joint Then we have to start talking about torque because now I can put a weight in my hand and That weight is now going to pull me. I'm gonna try to do this for you That weight is going to follow gravity straight downward And that's so difficult So straight downward. So now what torque is that doing is that producing? It's going the opposite way and that's where we have headbutting. Okay, that's where that's why the Bicep when you do a bicep curl That's why the bicep gets tired because it's being opposed by the weight of the arm and whatever weight you're holding Okay, so there are There's more this turned into a deeper physics lesson that I anticipated So let's do the red here So if we look at how far away the muscle is from the joint It's not very far. It's about that long that little line here, right? Here put little lines there Okay, but if we look at how far away the weight is from the joint my not straight line or not level line It's much further away, right? So a mass of five kilos in your hand would dominate five kilos of force coming up from the Or you know five kilos of weight times gravity would dominate the force the equivalent force from the muscle So what we can do is Tying this back into the half kneeling band pulldown we can use this to our advantage So we talked about Increasing the stress that you put on the shoulder joint by making your arm longer, right? I'm holding a band in my hand. My hand gets really far away from me And then I can pull down whereas if I pull down here not a lot of stress on the shoulder On the shoulder extension on the lap, okay? But now I'm gonna make you think outside the box a little bit because this is actually the reason that I'm doing it I can take this this idea of my shoulder and I can put something in my hand And I can extrapolate the idea of the shoulder all the way down To my abdominals and to my spine, right? So I take this over here and now I try to pull down Well, I could pull down with my shoulder But if I don't stabilize here in my trunk I'm just gonna lean back this way and that's going to extend my shoulder sure, but at what cost So what I'm doing is I'm lengthening in that lever and I'm giving you a little bit of reach And I'm getting all sorts of other good stuff like a serratus anterior in good position of your rib cage I'm using that to now Challenge your abdominals without a whole lot of weight, right? If you have to pull really hard with your lat your lat is not only going to be pulling against that band But it's also going to be pulling your back forward just because of how it attaches right it attaches on the spine pushes the spine forward So now I get some more extension and that's that's part of the reason that I have to address that with the abdominals Um So what we can do again to summarize half nearly band diagonal we can keep the arm straight and we can pull down Right, so now I have torque on my abs. Why don't you pull down all the way? Well when I pull down all the way Then I lose my moment arm again. So now my moment arm is like from here to here Instead of from here to here That's why we talked all about like if your only question is Why don't you pull down all the way? That's why You have to go back to the original physics. You have to go back to just simple simple bicep joint mechanics If you can understand that then you can start to extract extrapolate it into all sorts of other movements Um Just to summarize real quick So picture this if I pull down all the way and I pull down all the way to the side of my body Now I am now the band is basically right in line with my shoulder joint and my Intervertebral joints and so I lose the torque there If I do that then I'm no longer challenging the abdominals and the secret Of the half kneeling band diagonal is I don't care about what you're doing I just want your abdominals to turn on to help you get in a better position while you take your breaths boom Hope that helped see ya Any questions leave them below and subscribe