Hi Dugao 123
This issue is way more complex than this. There are a number of reasons why one muscle group or the other might be employed in quiet standing. If the hamstrings tend to be over developed and shortened and the glut max is under developed then the hamstrings are likely to be working excessively in a wide variety if activiies: standing up, walking, running squatting etc. It is important to work out why this may be and an individual assessment is needed. However tight hamstrings could indicate such a problem.