Muscle Repair. The process of muscle repair depends on the availability of amino acids, and understanding the sequence of events can help clarify why dietary protein is necessary. Whatever the degree of injury to your muscle, trauma to the fibers begins a series of actions to rebuild the damaged tissue.
Typically, babies begin sitting up between 4 and 7 months, Dr. Pitner says. You can help your cutie learn this skill by holding on to her arms when she's on her back and gently pulling her up to a sitting position. She'll enjoy the back-and-forth motion, so add some fun sound effects to make it even more exciting.
1 Keep in mind that the only way to build muscle is to push the muscle beyond its endurance limits. 2  But if you do so many sit-ups to the point that you start to feel a stinging sensation on your abdominals, you have done too much. 3  Your form will start to deteriorate and you won't be performing a proper sit-up.