Tight hip flexors can also make it harder for your glutes to activate—since they're opposing muscle groups, when one is really tight the other becomes lengthened. When a muscle is more lengthened than it should be, it takes away some of its ability to contract. When your glutes are in this compromised position, it can cause other muscles to do more work than they should, making your workouts less efficient and sometimes, increasing your risk of injury.
Although muscle stimulation occurs in the gym (or home gym) when lifting weights, muscle growth occurs afterward during rest periods. Without adequate rest and sleep (6 to 8 hours), muscles do not have an opportunity to recover and grow.[citation needed] Additionally, many athletes find that a daytime nap further increases their body's ability to recover from training and build muscles. Some bodybuilders add a massage at the end of each workout to their routine as a method of recovering.[50]
The majority of your workouts should be comprised of compound exercises. Common examples include squats, deadlifts, lunges, bench presses, rows, pull-ups, lat pull-downs, overhead presses, and so on. Isolation exercises should definitely also be a part of your program, just a smaller part in comparison. Common examples include bicep curls, tricep extensions, chest flies, lateral raises, leg curls, leg extensions, calf raises, and so on.

To do dips, place your hands at shoulder-width apart on a bench, with your body and feet stretched out in front of the bench. Slowly bend your elbows and lower your body down so that your butt nearly touches the floor. Lift back up with your arms to starting position; repeat, doing 3 x 8. If this isn't a high-intensity set for you, increase the resistance by lifting one foot off the floor.
For the bench press, start with a weight that you can lift comfortably. If you are a beginner, try lifting the bar along with 5lbs or 10lbs on each side. With arms at shoulder-width apart, grab onto the bar and slowly lower the bar until it's at nipple level; push up until your arms are fully extended upwards. Do 8–10 repetitions (reps) like this for three sets (3 x 8), adding additional weight each set. Once you have a few months of practice, slowly increase weight and go down to 6–8 reps per set, aiming to reach muscle failure at the end of the third set.
I fortunately remember the nutrition label for many foods. If it doesn’t have a label, I remember what I’ve studied. It just sticks mentally and saves me time as I don’t have to input my calories via tracking. I use to track calories (started like 5yrs ago) which did help me get a better understanding (started to remember within 6m) of which foods had what and at what amount.
When it comes to building muscle, there are numerous theories, methods, and preferences. Whether the goal is improved health, aesthetics, performance, or a combination of all three, there is no shortage of advice to help you get there. So much so that it can sometimes become overly complicated and you forget about the basic facts. But, it’s simpler than it seems.
(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.

That pump is tangible, real-time biofeedback to let you know that blood is flowing to your muscle cells, beginning a chain of events that stimulates protein synthesis. Maybe that'’s why it's easy to overlook how important good nutrition is in the mass-building equation. When you choose to eat, say, chicken instead of ice cream, there'’s no immediate muscle gratification -- no pump to keep you motivated.

When you don't spend enough time strengthening your butt, your other muscles can pay the price, says Metzl. See, when your butt isn't strong enough to support you during activities the way it should, you put more loading force on your hamstrings, which can injure them or other muscles, joints, and ligaments that your hamstrings come in contact with—like your calves or knees. Metzl says that when a patient comes in to see him about an injury, weak glutes are often part of the problem. 
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).
How to do it: Use just your bodyweight, dumbbells, or a resistance band around the top of your knee to activate your glute medius, Reames says. Assume the same setup of a basic squat, feet shoulder-width apart and knees neutral. Squat down, knees bent at 90° angles, and step to the side. Continue repeating this side-step motion down and return to your starting position. 
In addition to the HIIT sessions, it’s always a good idea to go for a 30–60-minute walk as many days per week as you can. I recommend getting a minimum of 10,000 steps every day. Use a phone app to track them. If you’re into jogging, swimming, hiking, or some other form of long-duration, fairly low-intensity cardio, that is fine to do as well, and as often as you like.
When it comes to building muscle, your body only knows or cares about the tension, fatigue and damage an exercise is generating… not the type of equipment you were using when performing that exercise. It really couldn’t give the slightest crap about that. For this reason, ALL types of exercises and ALL types of equipment are capable of stimulating muscle growth.
On harder training days, I consume upward of 500 g of carbs. It all comes down to finding the amount of carbs your body can actually utilize and consuming them strategically, rather than letting cravings or social situations determine it for you. Out-of-control carb intake leads to unwanted spikes in insulin, which lead to fat gain. It's that simple.

(11) “you can’t burn fat (lose weight) and build muscle at the same time” - you can. Protein builds muscle. A deficit loses weight. What you can’t do is : You can’t burn fat and store fat at the same time as you burn, then store. You can’t lose weight and gain weight at the same time. BUT, you can do all this in a day. Ever heard “fat burning” stops if you eat carbs? This is because that body can’t burn carbs and burn fat at the same time. It has to be one or the other. So if you are always eating, then you eventually hit a surplus, because the body is always storing fat. It can’t even burn dietary fat and burn body fat at the same time. It’s one or the other. What does this mean? Eating less = burning less = storing less. May be hard to understand over text, but’s it’s the same as: eat carbs = burn carbs = store carbs AND eat fats = burn fats = store fats AND eat carbs and fats = burn carbs and fats = store carbs and fats. Ever head “sugar burner” vs “fat burner”. Well, which one are you eating more? Fats or Carbs? Bingo! Eat more carbs and you burn more carbs = sugar burner. Eat more fats and your burn more fats = fat burner. Make sense? Don’t worry about losing weight and building muscle at the same time, just hit each angle. Protein for muscle. Deficit for weight loss via fat.

I’m going to cover this in detail in a bit, but for right now, just know this: it’s VERY possible (and common) to gain weight fast in the hopes of gaining muscle fast. The problem, however, is that the majority of the “weight” a person in this scenario will end up gaining will be body fat rather than muscle mass. This is something that needs to be avoided at all costs, and I’ll show you how a little later.

Reaching failure matters because tension matters. Failure is when the muscle cannot generate anymore force. Which means one applied (worked out) enough tension through the muscle to just want to give up. And guess what? Carrying groceries can do this for some. Why? We are all at different strength levels. So don’t worry about other people and what they can or cannot lift. I say this because FAILURE can be achieved with either light weights or heavy weights.
To avoid hip flexor pain, you should pay more attention to these muscles, Dr. Siegrist explains. When you are seated, your knees are bent and your hip muscles are flexed and often tighten up or become shortened. “Because we spend so much of our time in a seated position with the hip flexed, the hip flexor has the potential to shorten up. Then, when you are in a hurry because you are running to catch a bus or a plane, or you trip and fall, the muscle could become stretched. Here’s this stiff, brittle muscle that all of a sudden gets extended, and you could set yourself up for strain or some hip flexor pain.”
If you are standing, the hip flexors lift your leg when you step up on a stool. If you are lying flat on your back, the hip flexors can either lift your leg or lift your torso into a sit-up. In yoga, Navasana (Boat Pose) is especially good at strengthening the iliopsoas because it demands that the muscle isometrically contract to hold up the weight of the legs and torso.
Bodybuilding developed in the late 19th century, promoted in England by German Eugen Sandow, now considered as the "Father of Bodybuilding". He allowed audiences to enjoy viewing his physique in "muscle display performances". Although audiences were thrilled to see a well-developed physique, the men simply displayed their bodies as part of strength demonstrations or wrestling matches. Sandow had a stage show built around these displays through his manager, Florenz Ziegfeld. The Oscar-winning 1936 musical film The Great Ziegfeld depicts the beginning of modern bodybuilding, when Sandow began to display his body for carnivals.
This leaves you frustrated and yes……….with consistently tight hip flexors.  A crucial step is often missed with trying to stretch away tightness or pain. Before anymore blame is placed on the hip flexor muscle, it needs to be properly assessed. Then after an assessment is performed you can determine what the right hip flexor exercise for you to do is.
Whether you love or hate ‘em, squats are one of the best butt exercises for strengthening your backside. Experts say that if you want to run faster, jump higher and lift heavier, squatting low is the way to go. They might look easy, but prepare to work when you add a barbell, slam ball or heel raise to the mix. These squat variations not only add some power to your jumps and kicks, but they also help improve your knee stability and range of motion. So how low can you go? Try these exercises to find out.

Creating a workout playlist of high-energy tunes you love will not make your workout feel easier, but it may cause you to exercise harder without even realizing it. Best of all, you need only one or two great tunes to get you through this workout. If you are willing to try something a bit different, make your own music as you exercise. Sing, hum, clap your hands, whatever you can do to jam along to your playlist. It may give you an extra boost to finish strong.
Secure a flat resistance band just above your ankles and stand with your feet at about hip width, keeping feet forward. Keeping your weight in your heels, step your right foot laterally, maintaining the tension in the band. Keep the band taut as you step your left foot slightly to the right. Continue stepping sideways to your right for about 5 steps. Then step to your left to return to the starting position. Repeat three times.

To do dips, place your hands at shoulder-width apart on a bench, with your body and feet stretched out in front of the bench. Slowly bend your elbows and lower your body down so that your butt nearly touches the floor. Lift back up with your arms to starting position; repeat, doing 3 x 8. If this isn't a high-intensity set for you, increase the resistance by lifting one foot off the floor.
If you’re a beginner, you should train with three full-body workouts per week. In each one, do a compound pushing movement (like a bench press), a compound pulling movement (like a chinup), and a compound lower-body exercise (squat, trap-bar deadlift, for example). If you want to add in 1–2 other exercises like loaded carries or kettlebell swings as a finisher, that’s fine, but three exercises is enough to work the whole body.