Bridges, Quarter Squats, and Michael Jackson
This post is about weightlifting. I didn't know the following information when I started lifting in 2002, so I'm sharing this with anyone who might be where I was at that point knowledge wise.
Short Version:
1) In a strict bench press the lats help until the arms are parallel to the torso. That's why some people get stuck halfway up and start bridging.
2) Hams assist in the squat till you go so low they're shortened too much to help.
3) There's two sides to your calves. One works more when your leg is straight, the other when it's bent. If you do bodyweight calf raises, you need to also do them squatting down, similar in appearance to one of Michael Jackson's moves.
4) Overloading your core strength can cause your brain to shut you down to keep you from tearing your spine in half. Strengthening your core, spinal erectors, etc can help prevent this.
5) Bench doesn't let your shoulders rotate forward. Do presses that allow them to.
6) The long head of the triceps is involved with movement at both the arm AND the shoulder, so using different grips does affect activation. People calling it âbro scienceâ don't know science. I've included a quote and link from a buff chiropractor.
7) A few studies have shown that rotating the leg far enough either way puts emphasis on parts of the quads letting you shape them.
8) You can hold the same weight down by your hips longer than you can hold it with arms outstretched. This is important for deltoid work. Because of leverage, doing dumbbell deltoid raises lying on your side can put most of the load on the muscles while they are elongated instead of when the muscle is bunched up. Otherwise you're really only getting a workout at the top of the movement.
Lats and the Bench Press:
The lats attach to the upper arm and pull the upper arm to your side. Lat pulldowns and rows both involve the lats, obviously. But when bench pressing, with the elbows pulled in close, your upper arms go below your body. The lats help until the upper arms are pulled up parallel to the torso, then they can't help anymore. This is why people start to arch their backs and flare out their elbows, so they can include the lats in the movement again. Using proper form, about halfway up your benchpress, you lose the use of two large muscles, so it can be a sticking point.
Your hams do two things. They bend your knee, obviously, and because they're attached up at your pelvis, when the quads are contracting and holding the lower leg extended, the hams wind up helping pull your upper leg backwards, assisting your glutes. When the hams are bunched up, like at the bottom of a squat, they can't help much, so you lose the use of two large muscles.
This effect can also be used to put emphasis on your glutes. Hip thrusts, where you're lying on your back with your feet pulled close to you, or lying across a bench with your knees at about a 90 degree angle, shortens the hams and puts the load on your glutes.
Two Parts to your Calves:
There's two parts to your calves, the soleus and gastrocnemius. Standing calf raises hit the gastrocnemius more, and seated calf raises hit the soleus more. When there's a lack of equipment, some people will just do standing bodyweight calf raises. Basically standing up on their toes. But to hit the soleus more, the knees need to be bent. One of Michael Jackson's signature moves was him squatted down while standing up on his toes. I'm not saying you need to be able to balance on the tips of your toes like he did, but the movement looks similar.
Overloading Your Core Strength is like Hitting a Big Red Emergency Stop Button:
Your deep brain cares more about survival than looking good. If at any point your body feels like what you're doing is about to tear your spine, or something similarly damaging, you'll suddenly become weak as a kitten. Unless you're psychotic and practically immune to pain, in which case you're probably a powerlifter with a long medical history. As for the rest of us, doing one handed pushups and one legged squats strengthens the âcoreâ muscles, spinal erectors, and all those little muscles we don't feel till a lift goes wrong. Your deep down survival parts of your brain feeling safe will keep it from hitting the emergency stop button.
Relevant to this, people who benefit the most from free weight bench presses have bad balance. They're constantly making little corrections using muscles they wouldn't on a machine.
Bench Doesn't Allow for Shoulder Rotation:
With your back on a bench, your scapula (flat parts of your shoulder blades) are pressed against the bench and don't let your shoulders move forward. Doing one handed pushups, even just leaning over at an angle and pressing off your bathroom sink, can strengthen this important muscle group.
It has been suggested that different hand positions can target different parts of the triceps. This is where some people start claiming âbro scienceâ. Never mind studies done showing rotation of the femur can activate different parts of the quads more. How dare I try to compare apples and oranges. First off, there's research that shows that parts of the triceps are hit more at different shoulder elevations.
The following is from a study listed on the NIH's National Library of Medicine PMC6136322,
âThe different role of each head of the triceps brachii muscle in elbow extensionâ.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6136322/
â...Each head of the triceps brachii has a different pattern of force and activity during different shoulder elevations. The long head contributes to elbow extension more at shoulder elevation and the medial head takes over at 90° and above of shoulder elevation. This study provides further understanding of triceps brachii's for clinicians and health trainers who need to investigate the functional role of the triceps brachii in detail...â
This leads to the idea of doing overhead extensions to hit a different area of the triceps, because of the way the heads are attached.
But if we suggest that rotating the arm can alter the way the heads of the triceps are affected, some people get angry and claim there's no âproofâ. While I haven't found any studies directly done on humeral rotation and biceps / triceps activation, there's plenty of research on shoulder function and triceps involvement.
Doctor Jordan Shallow DC addressed the idea of arm rotation on his website themuscledoc.com,
https://themuscledoc.com/articles/triceps-the-long-and-short-of-it/
ââŚwe must remember that the triceps are a biarticulate muscle- meaning it is responsible for movement at both the elbow and the shoulder. Now this is where some nuanced anatomy comes into play. The triceps extends the elbow and also extends the shoulder; this is more or less common knowledge. But what many people donât know is when the shoulder is externally rotated the long head of the triceps acts in the motion of shoulder adduction. Let that sink in for a moment.
Now how does that relate to hand position? Well, if we think of the two options of hand positions when performing a triceps extension, we have pronated and supinated grip. Pronation is in essence a fancy term for internal rotation at the wrist (palms facing back in anatomical position). Where as supination is a fancy way of saying external rotation at the wrist (palms facing forward in anatomical position) now even though neither of these positions can effect the insertion point on the Ulna, it can however, effect the ease in which the shoulder can externally rotate.
In a supinated position the shoulder can move into external rotation with greater ease due to the fact that supination is already suggestive of external rotation. Therefore allowing the long head of the triceps to act as an adductor while it extends both the shoulder and the elbow, hence maximally shortening the long head of the muscle.
This explains the âreverse grip bench pressâ. A common exercise used by powerlifters and bodybuilders alike- the reverse grip which they are referring to is actually a supinated grip, again: suggestive of external rotation which allows for the long head of the triceps to fill its tertiary role as a shoulder adductor.
Admittedly, the details of long head triceps training are intricate and for many beginning lifters the nuance changes wont manifest itself in any noticeable increase of tension. But for advanced lifters looking to expedite both size in strength in their Clydesdale hoof triceps, be sure to try these subtle variations in your next workout...â
If we look at the other end of the body, we find some conflicting research on activation of the four parts of the quadriceps relative to hip rotation.
"The effect of different hip rotation angles on electromyography activity of the quadriceps muscle during closed kinetic chain tasks in healthy females" PMC6110206
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6110206/
(explanation of abbreviations added by me)
â...The results of this study show that the relative activities of RF (rectus femoris), VL (vastus lateralis), and VMO (vastus medialis) are different depending on hip rotation angle in CKC (closed kinetic chain) while standing on the toes. The hypothesis that VMO activity is higher than VL activity was not proven. However, during 15° and 30° of internal rotation, a neutral angle and 15° of external rotation, VL was more active than the other two muscles. At these angles VL activity was significantly higher than RF activity, but not higher than VMO activity. There was no significant difference among VL, VMO, and RF activities in 30° of internal rotation and 30° and 45° of external rotation.
There are similar studies investigating VMO and VL activity at different hip angles with controversial results. Laprade et al. found that in external knee rotation and internal hip rotation, electrical activity was higher in VMO compared to VL. Sykes and Wong compared the straight leg raise (SLR) in internal rotation, external rotation, and neutral position of the hip, and reported higher activity of VMO compared to VL in SLR with hip external rotation...â
So some research indicates it's possible to target parts of the quads by rotating your leg one way or the other.
And then there's the role of the 3 heads of the deltoids in shoulder rotation and how it affects force production that I won't even try to get into. I'll just point out that if you have an imbalance in the strength of your anterior, lateral, and posterior deltoids, it could possibly affect joint health.
However, I will point out how leverage affects the strain on the deltoids using a given weight.
I can hold a bag of groceries slightly away from my hip all day long, but if I try to extend my arm out to my side with that same weight I won't be able to hold it as long. Same weight, different leverage, different amount of force required. When doing a standing lateral raise I get the most strain at the top of the lift. (Going above shoulder level really only raises your shoulder to your ear and doesn't really do much for your lateral deltoid.) But if I lay on my side and lift a dumbbell from my leg towards the ceiling, the maximum strain happens when the muscle is elongated. Relative to this, in an isometric hold, strength gains only carry over about 15 degrees either way. I assume the same effect applies to a varying load due to leverage, meaning that you'll be stronger in the range of motion that took more strength to accomplish. Otherwise, with a standing lateral raise you're really only getting a workout at the top of the movement.
Also it's almost impossible to cheat those reps up, unlike the way some people look like they're trying to do a combination of jumping jacks and lateral raises.
The same concept applies to the posterior deltoids.
And if you really want to shock your delts, do negatives with a little more than you can normally lift. Lying on your side, drag the dumbbell up to you and press it overhead, which uses the triceps to help push it up, then straighten the arm and lower it to your side for lateral delts, or in front of you for posterior delts. For posterior delts, extend your other arm in front of you to brace, unless you're also trying to work on your core anti-rotation strength, at which point it becomes a kind of lying wood chopper move.