A thread on hip flexors - common myths, why they’re important, and how strengthen or release them

Hip flexors might be the most unfairly demonized group of muscles in the human body.

My goal is to dispel myths while also giving you better options to “release” them...
Hip flexors are like any other muscles - the adapt to the demands imposed on them.

If those demands are only:

- Sitting
- Squatting without full hip extension
- No single leg work

What do you think is going to happen?⁣
It is important to consider that muscle length is secondary to skeletal position.

For example, if I tip my pelvis forward, my hip flexors are naturally in a shortened position, while my glutes and hamstrings are in a lengthened position.

If I exercise in that orientation, it’s
again quite obvious that my hip flexors will by chronically short.

This is also why constantly (static) stretching the hamstrings is probably not a great idea if you have excessive anterior pelvic tilt.
Use it or lose it, & hip flexors are no different.

If you don't train them through a full range of motion then they won't have a reason to be anything but short because there’s relatively no demand place on them to be into a lengthened position.
It’s very common for people to 𝐜𝐨𝐧𝐟𝐮𝐬𝐞 "𝐭𝐢𝐠𝐡𝐭" 𝐡𝐢𝐩 𝐟𝐥𝐞𝐱𝐨𝐫𝐬 𝐰𝐢𝐭𝐡 𝐭𝐡𝐞𝐦 𝐛𝐞𝐢𝐧𝐠 "𝐭𝐨𝐨 𝐨𝐯𝐞𝐫𝐚𝐜𝐭𝐢𝐯𝐞" 𝐨𝐫 "𝐭𝐨𝐨 𝐬𝐭𝐫𝐨𝐧𝐠".⁣

Muscles need to lengthen in order to optimally contract. If a muscle is in a shortened position & tries to
contract, it will be quite limited in its ability to do so.

This is called “active insufficiency”.

Just because a muscle is tight does *not* mean it is strong.

In fact, I would argue most people with tight hip flexors, anterior pelvic tilt, etc, have quite weak hip flexors.
There’s a reason why people stretch their hip flexors every day and only feel relief for a few minutes...because it isn’t a comprehensive approach.

Here are some things I believe would help more than just stretching:
1.) Strengthen them through a full range of motion

Loading the muscle through its full range of stretch-to-contract would do a lot for people’s tight hip flexors & athletes’ performance.

This will help limit active insufficiency & give the hip flexors variability to lengthen.
A simple bridge like this is another alternative to light up your hamstrings while progressively increasing the height of your hips over time as your hip extension improves.
2.) Rethink your current stretching/warm-up routine

Consider that the antagonist musculature (glutes/hamstrings as hip extensors) can be facilitated in a position of (relatively) full hip extension.

Here is an example with verbal instructions.
Also, please work through your individual limits of hip extension.

Almost no one has full extension at first, & jamming your hip forward as far as you can in a stretch is not doing you any favors.

Stay within the range where you can keep a posterior pelvic tilt (hip extension).
3.) Finish your lower body reps in your relatively full hip extension

Again, if you’re dumping your pelvis forward during an entire squat or deadlift, you’re not only disadvantaging the hip flexors, but also your glutes & hamstrings while increasing load on your low back.

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More from @Conor_Harris_

20 Feb
A thread on Box Squats & their use for improving pelvic mechanics, a squat pattern, & force output

Box squats are often used as a means to improve squat strength.

In addition to that, a deeper look into the biomechanics can help us appreciate contextual application of them...
The first thing to consider is that box squats usually stop at ~90 degrees of hip flexion, which is associated with high degrees of internal rotation of the hips.

At this point, the sacrum bone tips forward and the pelvic bones rotate inward for femurs (leg bones) to pick up
room to move back into internal rotation.

This is necessary for producing force through the sticking point of a squat.

When someone is lacking proper internal rotation of the hips, you’ll often see them push their hips forward and arch their low back.

This anterior orientation
Read 11 tweets
8 Feb
A thread on ankle mobility, pronation, common misconceptions, & how to improve it

If you want to:
- Run fast
- Squat/deadlift a lot of weight
- Have good ankle mobility

You want your foot to properly pronate.

Pronation is the transition from force absorption to production...
The biggest misconception I see is that people think pronation is the collapsing inward of the foot as a whole.

That is not the case, and a collapsed foot is indicative of a foot that is likely compensating into pronation, rather than achieving true pronation.
True pronation of the foot involves relative:

- Tibial internal rotation (IR)
- Rearfoot eversion (turning in)
- Forefoot inversion (turning out)

Pronation occurs most in mid-stance in gait, where it is coupled with relative IR of the hips, femur, and tibia.
Read 12 tweets
21 Dec 20
A thread on the biomechanics of hip extension & how to train it

If you want to:
- Stand upright
- Sprint
- Train your glutes & hamstrings properly

You want to have hip extension. Problem is, majority of people & athletes don’t fully have it.

The reason why it’s often.. Image
missing is for a few common reasons:

- Sitting too much: Sitting is hip flexion and the body will adapt to the demands placed on it

- Not training through a full range of motion. Ending your squats and deadlifts with your butt out means you’re not in full hip extension Image
You’ll commonly see people who don’t have full hip extension stand in an Anterior Pelvic Tilt.

I think we know this tightens the hip flexors and back extensors, but it also tightens & restricts ligaments of the hips like the iliofemoral ligament.

This creates a hip flexion Image
Read 11 tweets
6 Nov 20
A thread on knee injuries in females and strategies to help minimize their potential

Weakness of the hip abductor & external rotator (ER) muscles is surprisingly common in otherwise normal & healthy females (Malinzak et al, 2001; Robinson, 2007).

That is just one piece of the..
overall puzzle.

Females tend to have a higher Q-Angle due to wider hips. The research is murky whether or not higher Q-Angle leads to more injuries, but honestly I’m not concerned about that as much as the biomechanical relevance of a higher angle.
When hips are wider, the sacrum is in a relatively higher amount of counter-nutation and the pelvic bones follow it into:

- External rotation
- Abduction
- Flexion
Read 10 tweets
16 Oct 20
A thread on how to improve hip internal rotation

If you want to:
- Be agile
- Be fast
- Get through the sticking point of a squat
- Deadlift

You want to have adequate hip internal rotation (IR).

However, in my experience it is often missing to some degree in many people.
The hip musculature responsible for hip IR are primarily:

- Adductors
- Inner Hamstrings
- Anterior fibers of the Gluteus Medius
- Tensor Fasciae Latae
In human movement, IR is necessary for mid-stance when we have our bodyweight on one leg and we need to propel it to the next leg. In cutting, we obviously need hip internal rotation to drive out of it effectively in a propulsive manner.
Read 13 tweets
9 Oct 20
A thread on the biomechanics of a lateral lunge - and why it’s an amazing position for those with tight glutes & piriformis.

This position is know for training the frontal plane, but it’s so much more than that.

Depending on how you do it, you can improve movement mechanics..
through an understanding of the constraints you can use with the exercise.

The lateral “lunge” is honestly a hinge, and that distinction matters when appreciating the context of when we should choose it in a program.

When we hinge, the pelvic inlet (top) comes closer together
while the pelvic outlet (bottom) spreads apart.

Notice where the posterior hip musculature (glutes & that all-so- known piriformis) attach.

When we hinge, we are essentially “spreading apart” that musculature while the pelvis goes into:

-Internal Rotation
-Adduction
-Extension
Read 8 tweets

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