As stated before, one of the primary hip flexor muscles is the psoas major. This muscle plays a role in core stabilization (something that is needed during running, squatting, and sitting) due to its attachment site at the spine. If there is a lack of core stability or poor movement patterns during these tasks then the hip flexor can become overworked/tired/fatigued (think what happens when your co workers or teammates don’t do their job, you have to pick up the slack and work harder, bringing you more stress and fatigue). It is when the hip flexor becomes fatigued that the sensation of tightness sets in. This is because the hip flexor has to “work harder” to compensate for other muscles not doing their job.
This test measures a participant's ability to stand up from a seated position as many times as possible in a thirty-second period of time.[2] Testing the number of times a person can stand up in a thirty-second period helps assess strength, flexibility, pain, and endurance,[2] which can help determine how far along a person is in rehabilitation, or how much work is still to be done. 

When it comes to finding the right meal plan, you have to start somewhere. Start with writing down what you eat in a food diary, calculate the calories you’re consuming daily (ex: 3,000 without protein shakes), and break those up into six meals (ex: 500 calories each), says Heath. Then, choose a macronutrient ratio. For example, the 40% protein, 40% carbs, 20% fat ratio is what Heath used to get bigger when he first started bodybuilding. “Buy a food scale, learn how to use it, and you may even have to learn to use the metric system, like grams instead of ounces,” Heath says. “You need to train your body to process food quickly, so eat every three hours.”

How can the muscle progress just because you held a weight for awhile when you could of held a heavier weight for less time? It won’t. It won’t grow because it’s not receiving new tension. Extending the rep by going slower is great, yes, but this slow must be the actual bar speed and not just slow because you can make it slow. You create actual bar speed by making light weight feel heavy. So lift light weight so that the fibers have to switch when it starts to feel heavy. This will increase your strength compared to just lifting heavier right away or all the time. This will help create an actual tempo with actual weights. Remember my example above about how the overall weight after making light weights feel heavy? This is because your muscles have sensed a level of tension that altered its force production so now you have to lift less, yet work harder. Read that again :) this is growth. This is how muscles sense it needs to grow. If you keep the same weight and never increase the weight, then you keep the same tension. This same tension is not enough to create new tension. Remember when I talked about failure? Well, the point where the fatigue of failure comes into play alters as well. It takes less time. That’s the point. Not much time is needed for growth, just break down the muscle as much as it can to a healthy level and do it again. Keep doing it and keep trying to increase the weight.
Are you tired of stretching or rolling out tight hip flexors with no improvements? If you are a runner, weight lifter, or team sport athlete, chances are you have heard a teammate or friend complain about having “tight hip flexors”. Either that or you yourself have had to deal with the problem. The problem with these tight hip flexors is that people will stretch, stretch, and ……..stretch some more (until the cows come home) and get NO RELIEF. This keeps people in a perpetual cycle of ALWAYS stretching their tight hip flexor with no real permanent relief.  The cycle looks something like this:
If you have blisters and other foot issues, it could be related to weak glutes. “A new blister could indicate a change in the gait of the runner, and it could be a sign of poor gait/biomechanics from glute weakness such as altered foot striker pattern,” says Bayes. (It’s worth mentioning, however, that this could also just be a sign of a sneaker problem, and you might just need to buy a better-fitting pair of shoes.)
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The function of the gluteus maximus is primarily upper leg (thigh) extension, such as moving the upper leg backward—think rising from a squat position. Another way of thinking about this is bringing the torso upright after being hinged forward. Think of a kettlebell swing and you’ll get a good visual for the major action of the gluteus maximus muscle.
Site enhancement oil, often called "santol" or "synthol" (no relation to the Synthol mouthwash brand), refers to oils injected into muscles to increase the size or change the shape. Some bodybuilders, particularly at the professional level, inject their muscles with such mixtures to mimic the appearance of developed muscle where it may otherwise be disproportionate or lagging.[54] This is known as "fluffing".[55][56] Synthol is 85% oil, 7.5% lidocaine, and 7.5% alcohol.[55] It is not restricted, and many brands are available on the Internet.[57] The use of injected oil to enhance muscle appearance is common among bodybuilders,[58][59] despite the fact that synthol can cause pulmonary embolisms, nerve damage, infections, sclerosing lipogranuloma,[60] stroke,[55] and the formation of oil-filled granulomas, cysts or ulcers in the muscle.[59][61][62] Rare cases might require surgical intervention to avoid further damage to the muscle and/or to prevent loss of life.[63]
How to do it: Sit comfortably into the leg press machine, pressing your back against the seat and your feet firmly planted to the platform. Lift off and press, straightening your legs so your knees assume a neutral position (not straight or severely bent). Continue lowering the platform until your knees create 90° angles, then return to the neutral starting position and repeat. 
Yuri Elkaim is one of the world’s most trusted health and fitness experts. A former pro soccer player turned NYT bestselling author of The All-Day Energy Diet and The All-Day Fat Burning Diet, his clear, science-backed advice has transformed the lives of more than 500,000 men and women and he’s on a mission to help 100 million people by 2040. Read his inspiring story, “From Soccer to Bed to No Hair on My Head” that started it all.
Your questions kinda ties everything together. You are already aware of “nutrient density” which is AWESOME. This is important because I believe one food may be more “healthier” over another due to its “nutrient density”. The other food is still healthy because it still contains nutrients, but the nutrients could be more dense…so this is why I think one food may be “healthier”, while the other just isn’t as “healthy”. It’s not, not healthy.. Make sense?
The gluteus maximus can be your best friend when it comes to safely 
performing backbends. Yet overusing this big muscle by clenching your butt as you backbend can lead to irritation and injury in the spine and sacroiliac (SI) joint. In order to mitigate excessive spinal compression in backbends, it’s helpful to use the buttocks and adductors (inner thighs) to support the weight of the pelvis, hips, and spine. Work on the following actions:
There are many potential reasons, but I am going to keep it simple and give you just two. The first and most common reason people suffer from underactive glutes or “glute amnesia” is due to lifestyle. Even when people train hard every day, if they spend the majority of the remainder of the day sitting down, then they are simply not using their glutes. And remember the old saying - if you don’t use it, you lose it. Unfortunately, this is just what happens with your glutes.
Are you tired of stretching or rolling out tight hip flexors with no improvements? If you are a runner, weight lifter, or team sport athlete, chances are you have heard a teammate or friend complain about having “tight hip flexors”. Either that or you yourself have had to deal with the problem. The problem with these tight hip flexors is that people will stretch, stretch, and ……..stretch some more (until the cows come home) and get NO RELIEF. This keeps people in a perpetual cycle of ALWAYS stretching their tight hip flexor with no real permanent relief.  The cycle looks something like this:
This is a great, functional exercise, and one I have written about in the past. The basic glute bridge is simple, just lay on your back with your knees bent, lifting your hips in the air. This is an excellent starting point, but most of you will quickly need to move on to more challenging variations to really get your glutes fired up. Check out my two favorites:
The patient generally presents with leg stiffness, weakness in the hip flexors, and impaired foot dorsiflexion in the second through fourth decades, although symptoms may be apparent in infancy or not until late adulthood. The gait disturbance progresses insidiously and continuously. Patients may also have paresthesia and mildly decreased vibratory sense below the knees and urinary urgency and incontinence late in the disease. On neurological examination, generally there are no abnormalities of the corticobulbar tracts or upper extremities, except possibly brisk deep tendon reflexes. In the lower extremities, deep tendon reflexes are pathologically increased and there is decreased hip flexion and ankle dorsiflexion. Crossed adductor reflexes, ankle clonus (Video 82, Cross‐Adductor Reflex; Video 84, Sustained Clonus), and extensor plantar responses are present. Hoffman's and Tromner's signs, as well as pes cavus, may be present. Occasionally, slight dysmetria may be seen on finger‐to‐nose testing in patients with long‐standing disease.
Lie on your back with knees bent and feet flat on the floor. Lift your hips to come into a bridge position with a neutral spine. Tuck your chin into your chest. Dig your elbows into the ground. Press the bottoms of your feet together and move your heels as close to your butt as possible. Inhale as you lower your hips toward the ground. Exhale as you lift your hips. Do 15 reps.

Let’s say your concentric is 30lbs and you don’t take my advice and keep the 30lbs for your eccentric. Let’s say, I assume you can do 50lbs on the eccentric, but choose to keep it at 30lbs. If you actually started off making light weight feel heavy, that 30lbs would of been around 10–20lbs and my assumption would of been 30lbs. My first assumption was a heavier weight. Your concentric was a heavier weight. What changed? Why did the overall weight become lighter after making light weight feel heavy?

This period also saw the rise of anabolic steroids in bodybuilding and many other sports. In bodybuilding lore, this is partly attributed to the rise of "mass monsters", beginning with Arnold Schwarzenegger, Sergio Oliva, and Lou Ferrigno in the late 1960s and early 1970s, and continuing through the 1980s with Lee Haney, the 1990s with Dorian Yates, Ronnie Coleman, and Markus Rühl, and up to the present day. Bodybuilders such as Greg Kovacs attained mass and size never seen previously but were not successful at the pro level. Others were renowned for their spectacular development of a particular body part, like Tom Platz or Paul Demayo for the leg muscles. At the time of shooting Pumping Iron, Schwarzenegger (while never admitting to steroid use until long after his retirement) said that "you have to do anything you can to get the advantage in competition".[citation needed] He would later say that he does not regret using anything.[8]
“Reg Park’s theory was that first you have to build the mass and then chisel it down to get the quality; you work on your body the way a sculptor would work on a piece of clay or wood or steel. You rough it out””the more carefully, the more thoroughly, the better”” then you start to cut and define. You work it down gradually until it’s ready to be rubbed and polished. And that’s when you really know about the foundation. Then all the faults of poor early training stand out as hopeless, almost irreparable flaws. [..]
Stand on your right foot and lift your left foot off the ground. Inhale as you step your left foot backward into a lunge, so that your left knee hovers above the ground. Exhale as you drive through your right heel to rise to a single-leg stance, bringing your left leg forward and up to hip height. Do 10-12 reps. Switch sides. Optional: Load this move by holding a kettlebell at your chest or a dumbbell in each hand.
The G-med and G-min perform similar functions, depending on the position of the knee and hip joints. With the knee extended, they abduct the thigh (out to the side away from the opposite leg). When running, they stabilize the leg during the single-support phase. With the hips flexed, they internally rotate the thigh. With the hips extended, they externally rotate the thigh.