Most problems with the hip flexors, however, don't originate in a lack of strength but in a lack of flexibility. To understand how these muscles lose their flexibility, imagine someone with a broken arm, her bent elbow encased in a plaster cast. When the cast is removed after six or eight weeks, the soft tissues around the elbow (muscles, tendons, ligaments, and even skin) will have shortened, and the elbow won't straighten out. It will take patient stretching over several weeks to restore the range of motion. Similarly, if the hip is constantly kept in a flexed position—like sitting—for hours every day, day after day, the hip flexors will shorten and shrink, limiting your ability to fully extend (straighten) the hip.
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!
Protein do not have a home really. They do have a pool on which amino acids are stored, but this isn’t much. Proteins home is actually our muscles. You know how we eat meat for protein? Well if we ate human meat, it would be protein. Muscle is protein. We eat protein to build muscle and other shit. Protein during a calorie surplus will get stored in our fat cells more than go towards building muscle or the pool. Anything eaten in a calorie surplus will be stored as fat.
I HATE that the resistance training community can be so tribal. I have been preaching to bodybuilders for years about the benefits of powerlifting, or Olympic lifting or kettlebells or even Crossfit style conditioning and many have been receptive. Learn from each other and achieve levels of fitness you simply could not have otherwise. Don’t brush off bodybuilding wisdom…it could be the missing factor in your program.