For example , weak abdominal muscles can lead to lower back strains .
If the Taekwondo student does not have strong muscles like the hip flexors , or abdominal muscles they are subject to injury while doing powerful punches or kicks .
Weak abdominal muscles can lead to lower back strains .
If the Taekwondo student does not have strong muscles like the hip flexors , or abdominal muscles they are subject to injury while doing powerful punches or kicks .