The hip flexors are a group of muscles in the front of the hip that act to lift the knee and bring the thigh towards the abdomen. The major muscles making up the hip flexors that we will focus on are the iliacus and the psoas, or the iliopsoas and the rectus femoris. The rectus femoris  is a “two joint muscle” because it crosses both the hip and knee joints. As a group, the hip flexors have attachments on the lumbar spine, the pelvis, and the femur. In addition to their major function of flexing the hip, their attachment on the spine makes them an important part of the core muscles and spinal stabilizers.
Expert tip: To make it harder, inch yourself close to a wall so your trunk is about a foot away. Bring what would be your “planted” leg on the wall, foot flat against the surface. From here, raise your “non-working leg” up into the air, keeping your knee bent. As you raise up into the glute bridge, you’ll drive your heel against the wall, raising your hips. You can also use a bench. And like the standard bridge, you can up the ante by adding weight. 
“Imagine you've fasted for over eight hours,” he says. “At breakfast, you're firing your metabolism off really high. If you don't eat for another five hours, your metabolism starts to slow right down and you have to try and kickstart it again with your next meal. If you eat every two and a half to three hours, it's like chucking a log on a burning fire.”

A: Start with the calculations above but don’t be afraid to adjust up or down. Your metabolism and physiology will adapt to more food by trying to maintain homeostasis and regulate your bodyweight. Some may have to increase more than others but the number on the scale doesn’t lie. If it’s not going up, then you probably need to increase your calories.
As I mentioned earlier, the exercises that come first in your workout (aka primary compound exercises) should usually be done in the 5-8 rep range. Exercises in the middle (aka your secondary compound exercises) should usually be done in the 8-10 rep range. Exercises done at the end of your workout (which is typically where isolation exercises belong) should usually be done in the 10-15 rep range.
How to do it: Stand tall with a dumbbell in each hand, arms to your sides. Put some slack in your knees so they’re in a neutral position, slightly bent. Extend one leg back; this non-weight-bearing leg should extend straight back until it’s parallel to the floor, while your planted leg remains engaged and planted firmly to the floor. Your weight-bearing knee should be neutral to just slightly bent to avoid hyperextension. Sink your arms toward the floor when you draw your elevated leg back, moving with the flow of gravity. Use your glutes to pull yourself back to the upright position.

It’s based on the principles of high intensity interval training — known as H.I.I.T. — which uses short bursts of strenuous exercise to make a big impact on the body. If moderate exercise — like a 20-minute jog — is good for your heart, lungs and metabolism, H.I.I.T. packs the benefits of that workout and more into a few minutes. It may sound too good to be true, but learning this exercise technique and adapting it to your life can mean saving hours at the gym. 

The hip flexors are a group of muscles in the front of the hip that act to lift the knee and bring the thigh towards the abdomen. The major muscles making up the hip flexors that we will focus on are the iliacus and the psoas, or the iliopsoas and the rectus femoris. The rectus femoris  is a “two joint muscle” because it crosses both the hip and knee joints. As a group, the hip flexors have attachments on the lumbar spine, the pelvis, and the femur. In addition to their major function of flexing the hip, their attachment on the spine makes them an important part of the core muscles and spinal stabilizers.

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.
Now, while all three are definitely beneficial to the process, I’d consider metabolic stress and muscular damage to be of secondary and tertiary importance, respectively. In addition, they are also things that will pretty much take care of themselves when implementing the workout guidelines and recommendations we’ve already covered (namely for volume, rep ranges, rest periods and exercise selection).
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.
A: If your goal is the largest accrual of muscle mass possible then there may be some benefit to ingesting nutrients with a period of 30-60 minutes after your workout. Does this have to be a protein shake? No, but ideally it should be a meal lower in fat to enhance the digest rate of nutrients within the gastrointestinal tract. However, if you have just eaten a mixed macronutrient meal pre-workout then you should keep in mind that that meal is still likely digesting so there’s no need to throw down the weights after your last set and rush to your locker to slam a protein shake.
Are you sitting right now? Squeeze your buttocks, then release them: You should feel them tighten, then slacken. While slack muscles aren’t necessarily a bad thing—all of our muscles shouldn’t be firing at all times, after all—resting all of your body weight on your slack glute muscles (as you do when you sit) creates a lengthening of the fascial tissues within and surrounding the glutes, which weakens the gluteals’ natural tension. When the buttocks are excessively weak, the quadriceps and hip flexors have to work harder to compensate, and these muscular imbalances often sneakily follow us onto our mats to cause problems and pain. Want help? Try these poses:
  Take note to see if the thigh rests down parallel to the ground (Picture 2) or if it stays up in the air (Picture 1) (You will need someone to be nearby to see what your leg does). Perform on both sides and compare. If the thigh does not stay raised up in the air then there is no true hip flexor tightness and stretching does not need to be performed. If one of the thigh/legs stays up noticeably higher than the other, then stretching will need to be performed. If your leg is able to hang down comfortably parallel to the ground or lower then you passed the test!
(6) “Needs to go somewhere” This is where I explain the end of point 3. Insulin is not a fat storage hormone. Insulin simply transports, nutrients, into cells for energy and then stores the nutrients. Protein is not stored, they are recycled, this is why it’s wise to be consistent with protein. Fats are stored as fat. Carbs are stored as glycogen. IF GLYCOGEN is full then insulin will transport the excess glucose to body fat as the glucose needs to go somewhere. It’s not just gonna sit in the blood. If so, this calls for chaos. People that are insulin resistant usually have this chaotic issue.
It’s a lofty goal: Gain 10 pounds of muscle in just one month. While such results are aggressive and can’t continue at the same torrid rate indefinitely, we’ve seen firsthand individuals who’ve followed our mass-gaining programs and reached double digits in four short weeks, averaging gains of 2-3 pounds a week. Trust us, it can be done. But if there’s one thing such a bold goal needs, it’s an ambitious training and nutrition strategy. In regard to nutrition, don’t even think about taking that aspect lightly. You can work out all you want, but if you don’t ingest adequate calories and macronutrients, you won’t build muscle. What and when you eat is paramount to your results, and you’ll find all you need to know about gaining mass in a short amount of time in our bulking diet meal plan.

Expert tip: “Optimum form and range of motion for the squat is very dependent on your physicality, structure, joint integrity, limb length, strength, flexibility, and current condition,” Reames says. Your range of motion is 90° max at the knee. Some guys will be able to go lower than this, but not everyone will squat to parallel, he says. And that’s totally okay. “Stick to form and the appropriate resistance levels for you; the squat is still one of the best and simplest moves for overall strength, building lower-body muscle, core strength, and athletic performance. 
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]

Bodybuilders also understand how to diet. This is perhaps the most important aspect other athletes can learn from. I can’t think of any athlete that comes close to bodybuilders who know how to build massive amounts of muscle and then can diet with the type of precision that gets them absolutely shredded on a specific date. Most resistance training sports use weight classes to compete. It doesn’t take a rocket scientist to see that shedding body fat without losing muscle can be a major advantage. Competing at a lower weight class because you are leaner while maintaining strength and performance is a very valuable and effective strategy. Diet to build LEAN muscle to keep weight low for a competitive advantage.

If you’ve been training longer than 6–12 months, you can split your workouts into upper- and lower-body days. The most common setup is to train upper body one day and lower the next so that each area gets trained twice in one week. If you train four days per week, you can train upper body on Monday, lower Tuesday, rest Wednesday, and then do upper body again on Thursday, lower body on Friday, and then rest on the weekend.
But, what about fats? Well, our body fat is the home for fats. Whatever fats not used for energy will be stored as fat. That’s the point of fat. This doesn’t mean fats make us fat, sure fats lead to direct fat gain, but this doesn’t mean weight gain. Fat vs weight gain is different. Fat gain can only lead to weight gain if you eat in a calorie surplus. Even if carbs to stored as fat, if you aren’t in a surplus…this fat will be used, so it doesn’t matter this is got stored as fat. Just stop filling up your glycogen levels unless you are always depleting then. Same with fats, just because they increase fat doesn’t mean they make us fat. INCREASED FAT VS INCREASED WEIGHT is different. If we eat fat we store fat. If we eat carbs we store carbs. If we store fat, that fat will only remain their and contribute to weight gain IF it’s not used for energy. If it’s used for energy then we are in a deficit unless we eat out way back to a surplus.
Do Belgian squats (or "single leg squats") with a dumbbell. Hold out in front of your chest a dumbbell using both hands. Standing in front of a bench, lift your right leg back so that it's parallel to the floor and resting comfortably on the bench. Bend into a squat using the left leg, so that the right knee almost hits the floor. Lift and repeat 3 x 8. Repeat using opposite leg.
The gluteus maximus is the largest and most superficial of the three gluteal muscles. It makes up a large portion of the shape and appearance of the hips. It is a narrow and thick fleshy mass of a quadrilateral shape, and forms the prominence of the nates. The gluteus medius is a broad, thick, radiating muscle, situated on the outer surface of the pelvis. It lies profound to the gluteus maximus and its posterior third is covered by the gluteus maximus, its anterior two-thirds by the gluteal aponeurosis, which separates it from the superficial fascia and integument. The gluteus minimus is the smallest of the three gluteal muscles and is situated immediately beneath the gluteus medius.
Hook a velcro cuff to a low cable pulley and then attach the cuff to your right ankle. Face the weight stack from a distance of about two feet, grasping the frame for support. Keep your knees and hips bent slightly and your abs tight, contract your right glutes to kickback the leg. Slowly bring your working leg forward, resisting the pull of the cable until you reach the starting position. Repeat for required reps, then switch legs.

Of course, you know what it feels like to have a tight muscle. But tight hips aren't just uncomfortable—they can lead to all sorts of other aches and pains, especially in the lower back. "People focus on the hips and say their hips are tight, but we don't always think about the fact that the lower back connects to our legs at the hip," Charlee Atkins, C.S.C.S., instructor at Soul Annex in New York City and creator of Le Stretch class, tells SELF. Tight hip flexors make it harder for your pelvis to rotate properly, which can cause your lower back to overcompensate, "and this can be a setup for lower-back injury," Teo Mendez, M.D., an orthopedic surgeon at NY Orthopedics who focuses on operative and non-operative management of sports-related injuries, musculoskeletal injuries, and arthritis, tells SELF.