Muscle cells can take anywhere from ONE TO SEVERAL DAYS to grow back bigger & stronger than before, which is why most EXPERTS DONT RECOMMEND working the SAME MUSCLE group on BACK-TO-BACK DAYS.
How long do muscles take to strengthen?
True beginners might see muscle growth within six weeks of starting a resistance training program, and advanced lifters may see results within six to eight weeks of switching up their usual strength training regimen.
How long does it take to strengthen lower back muscles?
A pulled back muscle may take anywhere from days to weeks to achieve a full recovery. Doctors assign a grade to sprains as a measure of severity. Grade 1 means that there is slight stretching in the ligament.