Grade III (severe): A complete tear in your muscle that causes severe pain and swelling and you can't bear weight on that leg, making it difficult to walk. You've also lost more than 50 percent of your muscle function. These injuries are less common and may need surgery to repair the torn muscle. They can take several months or more to completely heal.
The primary hip flexors are the rectus femoris, iliacus, psoas, iliocapsularis, and sartorius muscles. The rectus femoris muscle has two distinct origins proximally: the direct head and the reflected head. They originate at the AIIS and the anterior acetabular rim (in close proximity to the anterior hip capsule), respectively. The tendinous fibers of the rectus femoris coalesce distally and become confluent with the other quadriceps musculature in the thigh. The quadriceps consists of four distinct muscles: 1) the vastus intermedius; 2) the vastus lateralis; 3) the vastus medialis; and 4) the rectus femoris. The rectus femoris is the only quadriceps muscle that traverses both the hip and the knee joint. The rectus femoris is a powerful hip flexor, but it is largely dependent on the position of the knee and hip to assert its influence. It is most powerful when the knee is flexed, whereas significant power is lost when the knee is extended. The rectus femoris is innervated by the femoral nerve (i.e., the posterior division of L2 to L4).
Don’t take sets to the point of failure—where you absolutely can’t perform another rep. You should never get to where you’re turning purple and screaming like you’re getting interviewed by “Mean” Gene Okerlund before WrestleMania. Most of the time, you want to end your sets two reps before total failure. Not sure when that is? The moment your form breaks down, or you’re pretty sure it’s going to break down, end the set.
Most typical bodybuilding programs have way too many sets and reps and use the wrong exercises. However, if you lower the total volume, go heavier, and use compound movements as I’ve outlined above, there is nothing wrong with a body-part split for advanced lifters. In fact, it’s often less stressful to the joints than your average upper/lower split.
If your fitness goals are to get strong and build hard, visible muscle, then you’re going to want to train in three phases according to Heath. Strength, conditioning, and a blend of the two that works for you. “If you can get to the gym 4-5 days a week, that would be perfect,” he says. “You can still do chest/tri’s, back/bi’s, legs, shoulders, and make the fifth day a cleanup day, meaning focus on body parts you may be weaker in.” Check out Heath’s guide to finding your best muscle-building routine.
Stand tall with your hips square and bend your right knee, bringing your foot towards your bum. Grab the right foot with your right hand and actively pull the foot closer to your glutes. As you do this, send the right knee down towards the ground and keep both knees together. squeeze your butt to promote a posterior pelvic tilt and hold — then switch sides.
(4) Insulin is a fat storage hormone - this isn’t true, okay kinda. Like I mentioned, both insulin and protein trigger insulin. If insulin was the issue than high protein intakes should has a worse reputation beyond what it currently has. Insulin has a job of transporting nutrients into cells. Carbs have a more direct connection to insulin than protein, so when carbs are consumed, insulin is spiked higher. Insulin will take the carbs (sugars) and transport them into cells for energy and then the rest into glycogen to save for later. If glycogen is full, then insulin still has a job to do. It doesn’t just float around dumb founded. It takes the carbs (sugars) and stores then into fat. It’s smart like that. But, we abuse that system by eating too many carbs and being in a surplus. The body doesn’t want to convert carbs into fat, that’s what fats are for, yet we abuse and do it anyways.
(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 has been argued that purposely overtraining for a brief period can be beneficial. One article published by Muscle & Fitness magazine stated that you can "Overtrain for Big Gains". It suggested that if one is planning a restful holiday and does not wish to inhibit their bodybuilding lifestyle too much, they should overtrain before taking the holiday, so the body can recuperate and grow during the prolonged rest period. Overtraining can be used advantageously, as when a bodybuilder is purposely overtrained for a brief period of time to super compensate during a regeneration phase. These are known as "shock micro-cycles" and were a key training technique used by Soviet athletes.[53]